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added some libs and projects

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This commit is contained in:
Johannes Findeisen 2015-08-25 23:22:27 +02:00
commit c175b7c85c
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.gitignore vendored Normal file
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sketch_*

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BH1750_serial/BH1750_serial.ino Normal file
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/*
This is a simple code to test BH1750FVI Light senosr
communicate using I2C Protocol
this library enable 2 slave device address
Main address 0x23
secondary address 0x5C
connect this sensor as following :
VCC >>> 3.3V
SDA >>> A4
SCL >>> A5
addr >> A3
Gnd >>>Gnd
Written By : Mohannad Rawashdeh
*/
// First define the library :
#include <Wire.h>
#include <BH1750FVI.h>
BH1750FVI LightSensor;
void setup() { // put your setup code here, to run once:
Serial.begin(9600);
LightSensor.begin();
/*
Set the address for this sensor
you can use 2 different address
Device_Address_H "0x5C"
Device_Address_L "0x23"
you must connect Addr pin to A3 .
*/
LightSensor.SetAddress(Device_Address_L);//Address 0x5C
// To adjust the slave on other address , uncomment this line
// lightMeter.SetAddress(Device_Address_L); //Address 0x5C
//-----------------------------------------------
/*
set the Working Mode for this sensor
Select the following Mode:
Continuous_H_resolution_Mode
Continuous_H_resolution_Mode2
Continuous_L_resolution_Mode
OneTime_H_resolution_Mode
OneTime_H_resolution_Mode2
OneTime_L_resolution_Mode
The data sheet recommanded To use Continuous_H_resolution_Mode
*/
LightSensor.SetMode(Continuous_H_resolution_Mode);
Serial.println("Running...");
}
void loop() {
// put your main code here, to run repeatedly:
uint16_t lux = LightSensor.GetLightIntensity();// Get Lux value
Serial.print("LightX: ");
Serial.print(lux);
Serial.println(" lux");
delay(250);
}

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I2C_SLAVE_PHOTORESISTOR/I2C_SLAVE_PHOTORESISTOR.ino Normal file
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#include <Wire.h>
int lightPin = 0;
void setup()
{
Wire.begin(7); // join i2c bus with address #7
Wire.onRequest(requestEvent); // register event
Serial.begin(9600); //Begin serial communcation
}
void loop()
{
Serial.println(analogRead(lightPin));
delay(1000);
}
void requestEvent()
{
Wire.write(analogRead(lightPin)); // respond with message of 6 bytes
}

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LM35BH1750LCDI2C/LM35BH1750LCDI2C.ino Normal file
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// Written 2015 by Johannes Findeisen <you@hanez.org>
#include <Wire.h>
#include <BH1750FVI.h>
#include <LiquidCrystal_I2C.h>
BH1750FVI LightSensor;
LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 20 chars and 4 line display
// Define how many samples should be collected every $collectDelay miliseconds.
// After sample collection the temperature is beeing calculated and then
// send to the LCD.
int samples = 8;
// Collect delay between each sample.
int collectDelay = 1000;
// The pin where the status LED is connected to.
int ledPin = 13;
// The analog input pin where the LM35 is connected to.
int tempPin = 0;
// Just some variable initializations.
float tempC = 0;
float tempClast = 0;
float tempF = 0;
uint16_t lux = 0;
void setup()
{
pinMode(ledPin, OUTPUT);
LightSensor.begin();
LightSensor.SetAddress(Device_Address_L); // Address 0x23
LightSensor.SetMode(Continuous_H_resolution_Mode);
lcd.init();
lcd.backlight();
// Get data for the first time.
// Read this to understand the temperature calculation:
// http://www.danielandrade.net/2008/07/05/temperature-sensor-arduino/
tempC = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;
tempClast = tempC;
// Celsius to Fahrenheit conversion
tempF = (tempC * 9) / 5 + 32;
// Get light sensor data
lux = LightSensor.GetLightIntensity();
// Refresh the LCD output
lcd_refresh();
}
void loop()
{
int i;
tempC = 0;
for (i = 0; i <= (samples - 1); i++) {
tempC = tempC + ((5.0 * analogRead(tempPin) * 100.0) / 1024.0);
digitalWrite(ledPin, HIGH);
delay((collectDelay / 2));
digitalWrite(ledPin, LOW);
delay((collectDelay / 2));
}
// Calculate temperature
tempC = tempC / (float)samples;
// Celsius to Fahrenheit conversion.
tempF = (tempC * 9) / 5 + 32;
// Get light sensor data
lux = LightSensor.GetLightIntensity();
// Print results to the display.
lcd_refresh();
// Remember current temperature for next run.
tempClast = tempC;
}
// Prints results to the display
void lcd_refresh() {
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(lux);
lcd.print(" Lux");
lcd.setCursor(0, 1);
lcd.print(tempC);
lcd.print((char)223); // ASCII code 223 = "°"
lcd.print("C/");
lcd.print(tempF);
lcd.print((char)223); // ASCII code 223 = "°"
lcd.print("F");
}

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LM35BH1750LCDI2C_ArduinoI2C/LM35BH1750LCDI2C_ArduinoI2C.ino Normal file
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// Written 2015 by Johannes Findeisen <you@hanez.org>
#include <Wire.h>
#include <BH1750FVI.h>
#include <LiquidCrystal_I2C.h>
BH1750FVI LightSensor;
LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 20 chars and 4 line display
// Define how many samples should be collected every $collectDelay miliseconds.
// After sample collection the temperature is beeing calculated and then
// send to the LCD.
int samples = 8;
// Collect delay between each sample.
int collectDelay = 1000;
// The pin where the status LED is connected to.
int ledPin = 13;
// The analog input pin where the LM35 is connected to.
int tempPin = 0;
// Just some variable initializations.
float tempC = 0;
float tempClast = 0;
float tempF = 0;
uint16_t lux = 0;
int photo = 0;
void setup()
{
pinMode(ledPin, OUTPUT);
Wire.begin();
LightSensor.begin();
LightSensor.SetAddress(Device_Address_L); // Address 0x23
LightSensor.SetMode(Continuous_H_resolution_Mode);
lcd.init();
lcd.backlight();
// Get data for the first time.
// Read this to understand the temperature calculation:
// http://www.danielandrade.net/2008/07/05/temperature-sensor-arduino/
tempC = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;
tempClast = tempC;
// Celsius to Fahrenheit conversion
tempF = (tempC * 9) / 5 + 32;
// Get light sensor data
lux = LightSensor.GetLightIntensity();
// Get data from other Arduino on 0x07
read_wire();
// Refresh the LCD output
lcd_refresh();
}
void loop()
{
int i;
tempC = 0;
for (i = 0; i <= (samples - 1); i++) {
tempC = tempC + ((5.0 * analogRead(tempPin) * 100.0) / 1024.0);
digitalWrite(ledPin, HIGH);
delay((collectDelay / 2));
digitalWrite(ledPin, LOW);
delay((collectDelay / 2));
}
// Calculate temperature
tempC = tempC / (float)samples;
// Celsius to Fahrenheit conversion.
tempF = (tempC * 9) / 5 + 32;
// Get light sensor data
lux = LightSensor.GetLightIntensity();
// Get data from I2C attached Arduino
read_wire();
// Print results to the display.
lcd_refresh();
// Remember current temperature for next run.
tempClast = tempC;
}
// Prints results to the display
void lcd_refresh() {
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(lux);
lcd.print(" Lux / ");
lcd.print(photo);
lcd.print(" Pr");
lcd.setCursor(0, 1);
lcd.print(tempC);
lcd.print((char)223); // ASCII code 223 = "°"
lcd.print("C/");
lcd.print(tempF);
lcd.print((char)223); // ASCII code 223 = "°"
lcd.print("F");
}
void read_wire() {
Wire.requestFrom(7, 1); // request 1 bytes from slave device #7
photo = Wire.read();
}

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libraries/BH1750FVI/BH1750FVI.cpp Normal file
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#include "BH1750FVI.h"
#include "Arduino.h"
BH1750FVI::BH1750FVI(){
}
void BH1750FVI::begin(void){
Wire.begin();
I2CWriteTo(Power_On ); //Turn it On
pinMode(AddrPin,OUTPUT);
digitalWrite(AddrPin,HIGH);
}
void BH1750FVI::Sleep(void){
I2CWriteTo(Power_Down ); //Turn it off , Reset operator won't work in this mode
}
void BH1750FVI::Reset(void){
I2CWriteTo(Power_On ); //Turn it on again
I2CWriteTo(reset ); //Reset
}
void BH1750FVI::SetAddress(uint8_t add){
switch (add){
case Device_Address_L:
address_value=Device_Address_L;
digitalWrite(AddrPin,LOW);
state=false;
break;
case Device_Address_H:
address_value=Device_Address_H;
digitalWrite(AddrPin,HIGH);
state=true;
break;
}
}
void BH1750FVI::SetMode(uint8_t MODE){
switch(MODE){
case Continuous_H_resolution_Mode:
break;
case Continuous_H_resolution_Mode2:
break;
case Continuous_L_resolution_Mode:
break;
case OneTime_H_resolution_Mode:
break;
case OneTime_H_resolution_Mode2:
break;
case OneTime_L_resolution_Mode:
break;
}
delay(10);
I2CWriteTo(MODE);
}
uint16_t BH1750FVI::GetLightIntensity(void){
uint16_t Intensity_value;
if(state ==true){
Wire.beginTransmission(Device_Address_H);
Wire.requestFrom(Device_Address_H, 2);
}
if(state ==false){
Wire.beginTransmission(Device_Address_L);
Wire.requestFrom(Device_Address_L, 2);
}
Intensity_value = Wire.read();
Intensity_value <<= 8;
Intensity_value |= Wire.read();
Wire.endTransmission();
Intensity_value=Intensity_value/1.2;
return Intensity_value;
}
void BH1750FVI::I2CWriteTo(uint8_t DataToSend){
Wire.beginTransmission(address_value);
Wire.write(DataToSend);
Wire.endTransmission();
}

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libraries/BH1750FVI/BH1750FVI.h Normal file
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/* This library for Digital Light sensor BH1750FVI
use I2C Communication protocal , SDA,SCL Are required
to interface with this sensor
pin configuration :
VCC >>> 3.3V
SDA >>> A4
SCL >>> A5
ADDR >> A3 "Optional"
GND >>> gnd
written By : Mohannad Rawashdeh
www.genotronex.com
*/
#ifndef BH1750FVI_h
#define BH1750FVI_h
#include "Arduino.h"
#include "Wire.h"
#define Device_Address_L 0x23 // Device address when address pin LOW
#define Device_Address_H 0x5C // Device address when address pin LOW
//all command here taken from Data sheet OPECODE Table page 5
#define Power_Down 0x00
#define Power_On 0x01
#define reset 0x07
#define Continuous_H_resolution_Mode 0x10
#define Continuous_H_resolution_Mode2 0x11
#define Continuous_L_resolution_Mode 0x13
#define OneTime_H_resolution_Mode 0x20
#define OneTime_H_resolution_Mode2 0x21
#define OneTime_L_resolution_Mode 0x23//As well as address value
#define AddrPin 17 // Address pin enable
class BH1750FVI {
public:
BH1750FVI();
void begin(void);
void Sleep(void);
void SetMode(uint8_t MODE);
void Reset(void);
void SetAddress(uint8_t add);
uint16_t GetLightIntensity(void);
private:
void I2CWriteTo(uint8_t DataToSend);
byte address_value;
boolean state;
};
#endif

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libraries/BH1750FVI/BH1750_LCD/BH1750_LCD.ino Normal file
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/*
This is a simple code to test BH1750FVI Light senosr
communicate using I2C Protocol
this library enable 2 slave device address
Main address 0x23
secondary address 0x5C
connect this sensor as following :
VCC >>> 3.3V
SDA >>> A4
SCL >>> A5
addr >> A3
Gnd >>>Gnd
Written By : Mohannad Rawashdeh
*/
// First define the library :
#include <BH1750FVI.h> // Sensor Library
#include <Wire.h> // I2C Library
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
uint16_t Light_Intensity=0;
// Call the function
BH1750FVI LightSensor;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
lcd.begin(16, 2);
// call begin Function so turn the sensor On .
LightSensor.begin();
LightSensor.SetAddress(Device_Address_H); //Address 0x5C
LightSensor.SetMode(Continuous_H_resolution_Mode);
lcd.setCursor(0, 0);
lcd.print("BH1750 Sensor");
lcd.setCursor(1, 1);
lcd.print("Please wait...");
delay(3000);
lcd.clear();
}
void loop() {
// put your main code here, to run repeatedly:
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(" Intensity = ");
lcd.setCursor(5, 1);
Light_Intensity = LightSensor.GetLightIntensity();
lcd.print(Light_Intensity);
lcd.print(" Lux");
delay(2000);
}

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libraries/BH1750FVI/BH1750_Led/BH1750_Led.ino Normal file
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/*
This is a simple code to test BH1750FVI Light senosr
communicate using I2C Protocol
this library enable 2 slave device address
Main address 0x23
secondary address 0x5C
connect this sensor as following :
VCC >>> 3.3V
SDA >>> A4
SCL >>> A5
addr >> A3
Gnd >>>Gnd
Written By : Mohannad Rawashdeh
*/
// First define the library :
#include <BH1750FVI.h> // Sensor Library
#include <Wire.h> // I2C Library
uint16_t Light_Intensity=0;
// Call the function
#define LedPin 9 // led connecting to pin D9
BH1750FVI LightSensor;
int SensorValue =0;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
// call begin Function so turn the sensor On .
LightSensor.begin();
/*
Set the address for this sensor
you can use 2 different address
Device_Address_H "0x5C"
Device_Address_L "0x23"
you must connect Addr pin to A3 .
*/
LightSensor.SetAddress(Device_Address_H); //Address 0x5C
// To adjust the slave on other address , uncomment this line
// lightMeter.SetAddress(Device_Address_L); //Address 0x5C
//-----------------------------------------------
/*
set the Working Mode for this sensor
Select the following Mode:
Continuous_H_resolution_Mode
Continuous_H_resolution_Mode2
Continuous_L_resolution_Mode
OneTime_H_resolution_Mode
OneTime_H_resolution_Mode2
OneTime_L_resolution_Mode
The data sheet recommanded To use Continuous_H_resolution_Mode
*/
LightSensor.SetMode(Continuous_H_resolution_Mode);
pinMode(9,OUTPUT) // Connect LED With 100ohm resistor
// to pin D9
}
void loop() {
// put your main code here, to run repeatedly:
// call GetLightIntensity() Function , so the sensor read
//the Intensity Value and send it
Light_Intensity=LightSensor.GetLightIntensity();
delay(50);
SensorValue=map(Light_Intensity,0,2000,255,0);
SensorValue=constrain(SensorValue,255,0);
digitalWrite(LedPin,SensorValue);
// ready to another reading .
}

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libraries/BH1750FVI/BH1750_serial/BH1750_serial.ino Normal file
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/*
This is a simple code to test BH1750FVI Light senosr
communicate using I2C Protocol
this library enable 2 slave device address
Main address 0x23
secondary address 0x5C
connect this sensor as following :
VCC >>> 3.3V
SDA >>> A4
SCL >>> A5
addr >> A3
Gnd >>>Gnd
Written By : Mohannad Rawashdeh
*/
// First define the library :
#include <Wire.h>
#include <BH1750FVI.h>
BH1750FVI LightSensor;
void setup() { // put your setup code here, to run once:
Serial.begin(9600);
LightSensor.begin();
/*
Set the address for this sensor
you can use 2 different address
Device_Address_H "0x5C"
Device_Address_L "0x23"
you must connect Addr pin to A3 .
*/
LightSensor.SetAddress(Device_Address_H);//Address 0x5C
// To adjust the slave on other address , uncomment this line
// lightMeter.SetAddress(Device_Address_L); //Address 0x5C
//-----------------------------------------------
/*
set the Working Mode for this sensor
Select the following Mode:
Continuous_H_resolution_Mode
Continuous_H_resolution_Mode2
Continuous_L_resolution_Mode
OneTime_H_resolution_Mode
OneTime_H_resolution_Mode2
OneTime_L_resolution_Mode
The data sheet recommanded To use Continuous_H_resolution_Mode
*/
LightSensor.SetMode(Continuous_H_resolution_Mode);
Serial.println("Running...");
}
void loop() {
// put your main code here, to run repeatedly:
uint16_t lux = LightSensor.GetLightIntensity();// Get Lux value
Serial.print("Light: ");
Serial.print(lux);
Serial.println(" lux");
delay(1000);
}

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libraries/BH1750FVI/keywords.txt Normal file
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#######################################
# Syntax Coloring Map For BH1750FVI
#######################################
#######################################
# Datatypes (KEYWORD1)
#######################################
KEYWORD1
BH1750FVI KEYWORD1
#######################################
# Methods and Functions (KEYWORD2)
#######################################
KEYWORD2
begin KEYWORD2
Sleep KEYWORD2SetMode KEYWORD2Reset KEYWORD2GetLightIntensity KEYWORD2
#######################################
# Constants (LITERAL1)
#######################################

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libraries/LiquidCrystal_I2C/.gitattributes vendored Normal file
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# Auto detect text files and perform LF normalization
* text=auto
# Custom for Visual Studio
*.cs diff=csharp
*.sln merge=union
*.csproj merge=union
*.vbproj merge=union
*.fsproj merge=union
*.dbproj merge=union
# Standard to msysgit
*.doc diff=astextplain
*.DOC diff=astextplain
*.docx diff=astextplain
*.DOCX diff=astextplain
*.dot diff=astextplain
*.DOT diff=astextplain
*.pdf diff=astextplain
*.PDF diff=astextplain
*.rtf diff=astextplain
*.RTF diff=astextplain

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libraries/LiquidCrystal_I2C/.gitignore vendored Normal file
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# Compiled Object files
*.slo
*.lo
*.o
*.obj
# Compiled Dynamic libraries
*.so
*.dylib
*.dll
# Fortran module files
*.mod
# Compiled Static libraries
*.lai
*.la
*.a
*.lib
# Executables
*.exe
*.out
*.app
# =========================
# Operating System Files
# =========================
# OSX
# =========================
.DS_Store
.AppleDouble
.LSOverride
# Icon must end with two \r
Icon
# Thumbnails
._*
# Files that might appear on external disk
.Spotlight-V100
.Trashes
# Directories potentially created on remote AFP share
.AppleDB
.AppleDesktop
Network Trash Folder
Temporary Items
.apdisk
# Windows
# =========================
# Windows image file caches
Thumbs.db
ehthumbs.db
# Folder config file
Desktop.ini
# Recycle Bin used on file shares
$RECYCLE.BIN/
# Windows Installer files
*.cab
*.msi
*.msm
*.msp

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libraries/LiquidCrystal_I2C/LiquidCrystal_I2C.cpp Normal file
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// LiquidCrystal_I2C V2.0 - Mario H. atmega@xs4all.nl
// Mods for Chinese I2C converter board - Murray R. Van Luyn. vanluynm@iinet.net.au
#include "LiquidCrystal_I2C.h"
#include <inttypes.h>
#include "Wire.h"
#include "Arduino.h"
// When the display powers up, it is configured as follows:
//
// 1. Display clear
// 2. Function set:
// DL = 1; 8-bit interface data
// N = 0; 1-line display
// F = 0; 5x8 dot character font
// 3. Display on/off control:
// D = 0; Display off
// C = 0; Cursor off
// B = 0; Blinking off
// 4. Entry mode set:
// I/D = 1; Increment by 1
// S = 0; No shift
//
// Note, however, that resetting the Arduino doesn't reset the LCD, so we
// can't assume that its in that state when a sketch starts (and the
// LiquidCrystal constructor is called).
LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr,uint8_t lcd_cols,uint8_t lcd_rows)
{
_Addr = lcd_Addr;
_cols = lcd_cols;
_rows = lcd_rows;
_backlightval = LCD_NOBACKLIGHT;
}
void LiquidCrystal_I2C::init(){
init_priv();
}
void LiquidCrystal_I2C::init_priv()
{
Wire.begin();
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
begin(_cols, _rows);
}
void LiquidCrystal_I2C::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
if (lines > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = lines;
// for some 1 line displays you can select a 10 pixel high font
if ((dotsize != 0) && (lines == 1)) {
_displayfunction |= LCD_5x10DOTS;
}
// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
// according to datasheet, we need at least 40ms after power rises above 2.7V
// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
delayMicroseconds(50000);
// Now we pull both RS and R/W low to begin commands
expanderWrite(_backlightval); // reset expanderand turn backlight off (Bit 8 =1)
delay(1000);
//put the LCD into 4 bit mode
// this is according to the hitachi HD44780 datasheet
// figure 24, pg 46
// we start in 8bit mode, try to set 4 bit mode
write4bits(0x30);
delayMicroseconds(4500); // wait min 4.1ms
// second try
write4bits(0x30);
delayMicroseconds(4500); // wait min 4.1ms
// third go!
write4bits(0x30);
delayMicroseconds(150);
// finally, set to 4-bit interface
write4bits(0x20);
// set # lines, font size, etc.
command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
display();
// clear it off
clear();
// Initialize to default text direction (for roman languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
command(LCD_ENTRYMODESET | _displaymode);
home();
}
/********** high level commands, for the user! */
void LiquidCrystal_I2C::clear(){
command(LCD_CLEARDISPLAY);// clear display, set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void LiquidCrystal_I2C::home(){
command(LCD_RETURNHOME); // set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void LiquidCrystal_I2C::setCursor(uint8_t col, uint8_t row){
int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
if ( row > _numlines ) {
row = _numlines-1; // we count rows starting w/0
}
command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
}
// Turn the display on/off (quickly)
void LiquidCrystal_I2C::noDisplay() {
_displaycontrol &= ~LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal_I2C::display() {
_displaycontrol |= LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turns the underline cursor on/off
void LiquidCrystal_I2C::noCursor() {
_displaycontrol &= ~LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal_I2C::cursor() {
_displaycontrol |= LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turn on and off the blinking cursor
void LiquidCrystal_I2C::noBlink() {
_displaycontrol &= ~LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal_I2C::blink() {
_displaycontrol |= LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// These commands scroll the display without changing the RAM
void LiquidCrystal_I2C::scrollDisplayLeft(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
}
void LiquidCrystal_I2C::scrollDisplayRight(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
}
// This is for text that flows Left to Right
void LiquidCrystal_I2C::leftToRight(void) {
_displaymode |= LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This is for text that flows Right to Left
void LiquidCrystal_I2C::rightToLeft(void) {
_displaymode &= ~LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'right justify' text from the cursor
void LiquidCrystal_I2C::autoscroll(void) {
_displaymode |= LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'left justify' text from the cursor
void LiquidCrystal_I2C::noAutoscroll(void) {
_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// Allows us to fill the first 8 CGRAM locations
// with custom characters
void LiquidCrystal_I2C::createChar(uint8_t location, uint8_t charmap[]) {
location &= 0x7; // we only have 8 locations 0-7
command(LCD_SETCGRAMADDR | (location << 3));
for (int i=0; i<8; i++) {
write(charmap[i]);
}
}
// Turn the (optional) backlight off/on
void LiquidCrystal_I2C::noBacklight(void) {
_backlightval=LCD_NOBACKLIGHT;
expanderWrite(0);
}
void LiquidCrystal_I2C::backlight(void) {
_backlightval=LCD_BACKLIGHT;
expanderWrite(0);
}
/*********** mid level commands, for sending data/cmds */
inline void LiquidCrystal_I2C::command(uint8_t value) {
send(value, 0);
}
inline size_t LiquidCrystal_I2C::write(uint8_t value) {
send(value, Rs);
return 0;
}
/************ low level data pushing commands **********/
// write either command or data
void LiquidCrystal_I2C::send(uint8_t value, uint8_t mode) {
uint8_t highnib = value & 0xF0;
uint8_t lownib = value << 4;
write4bits((highnib)|mode);
write4bits((lownib)|mode);
}
void LiquidCrystal_I2C::write4bits(uint8_t value) {
expanderWrite(value);
pulseEnable(value);
}
void LiquidCrystal_I2C::expanderWrite(uint8_t _data){
Wire.beginTransmission(_Addr);
Wire.write((int)(_data) | _backlightval);
Wire.endTransmission();
}
void LiquidCrystal_I2C::pulseEnable(uint8_t _data){
expanderWrite(_data | En); // En high
delayMicroseconds(1); // enable pulse must be >450ns
expanderWrite(_data & ~En); // En low
delayMicroseconds(50); // commands need > 37us to settle
}
// Alias functions
void LiquidCrystal_I2C::cursor_on(){
cursor();
}
void LiquidCrystal_I2C::cursor_off(){
noCursor();
}
void LiquidCrystal_I2C::blink_on(){
blink();
}
void LiquidCrystal_I2C::blink_off(){
noBlink();
}
void LiquidCrystal_I2C::load_custom_character(uint8_t char_num, uint8_t *rows){
createChar(char_num, rows);
}
void LiquidCrystal_I2C::setBacklight(uint8_t new_val){
if(new_val){
backlight(); // turn backlight on
}else{
noBacklight(); // turn backlight off
}
}
void LiquidCrystal_I2C::printstr(const char c[]){
//This function is not identical to the function used for "real" I2C displays
//it's here so the user sketch doesn't have to be changed
print(c);
}
// unsupported API functions
void LiquidCrystal_I2C::off(){}
void LiquidCrystal_I2C::on(){}
void LiquidCrystal_I2C::setDelay (int cmdDelay,int charDelay) {}
uint8_t LiquidCrystal_I2C::status(){return 0;}
uint8_t LiquidCrystal_I2C::keypad (){return 0;}
uint8_t LiquidCrystal_I2C::init_bargraph(uint8_t graphtype){return 0;}
void LiquidCrystal_I2C::draw_horizontal_graph(uint8_t row, uint8_t column, uint8_t len, uint8_t pixel_col_end){}
void LiquidCrystal_I2C::draw_vertical_graph(uint8_t row, uint8_t column, uint8_t len, uint8_t pixel_row_end){}
void LiquidCrystal_I2C::setContrast(uint8_t new_val){}

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// LiquidCrystal_I2C V2.0 - Mario H. atmega@xs4all.nl
// Mods for Chinese I2C converter board - Murray R. Van Luyn. vanluynm@iinet.net.au
#ifndef LiquidCrystal_I2C_h
#define LiquidCrystal_I2C_h
#include <inttypes.h>
#include "Print.h"
#include <Wire.h>
// commands
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETCGRAMADDR 0x40
#define LCD_SETDDRAMADDR 0x80
// flags for display entry mode
#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00
// flags for display on/off control
#define LCD_DISPLAYON 0x04
#define LCD_DISPLAYOFF 0x00
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKON 0x01
#define LCD_BLINKOFF 0x00
// flags for display/cursor shift
#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00
// flags for function set
#define LCD_8BITMODE 0x10
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00
// flags for backlight control
#define LCD_BACKLIGHT B00001000
#define LCD_NOBACKLIGHT B00000000
#define En B00000100 // Enable bit
#define Rw B00000010 // Read/Write bit
#define Rs B00000001 // Register select bit
class LiquidCrystal_I2C : public Print {
public:
LiquidCrystal_I2C(uint8_t lcd_Addr,uint8_t lcd_cols,uint8_t lcd_rows);
void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS );
void clear();
void home();
void noDisplay();
void display();
void noBlink();
void blink();
void noCursor();
void cursor();
void scrollDisplayLeft();
void scrollDisplayRight();
void printLeft();
void printRight();
void leftToRight();
void rightToLeft();
void shiftIncrement();
void shiftDecrement();
void noBacklight();
void backlight();
void autoscroll();
void noAutoscroll();
void createChar(uint8_t, uint8_t[]);
void setCursor(uint8_t, uint8_t);
virtual size_t write(uint8_t);
void command(uint8_t);
void init();
////compatibility API function aliases
void blink_on(); // alias for blink()
void blink_off(); // alias for noBlink()
void cursor_on(); // alias for cursor()
void cursor_off(); // alias for noCursor()
void setBacklight(uint8_t new_val); // alias for backlight() and nobacklight()
void load_custom_character(uint8_t char_num, uint8_t *rows); // alias for createChar()
void printstr(const char[]);
////Unsupported API functions (not implemented in this library)
uint8_t status();
void setContrast(uint8_t new_val);
uint8_t keypad();
void setDelay(int,int);
void on();
void off();
uint8_t init_bargraph(uint8_t graphtype);
void draw_horizontal_graph(uint8_t row, uint8_t column, uint8_t len, uint8_t pixel_col_end);
void draw_vertical_graph(uint8_t row, uint8_t column, uint8_t len, uint8_t pixel_col_end);
private:
void init_priv();
void send(uint8_t, uint8_t);
void write4bits(uint8_t);
void expanderWrite(uint8_t);
void pulseEnable(uint8_t);
uint8_t _Addr;
uint8_t _displayfunction;
uint8_t _displaycontrol;
uint8_t _displaymode;
uint8_t _numlines;
uint8_t _cols;
uint8_t _rows;
uint8_t _backlightval;
};
#endif

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LiquidCrystal_I2C
=================
A reimplementation of the standard Arduino LCD library, configured to work with parallel HD44780 compatible LCDs, and interfaced via a Chinese PCF8574 I2C serial extender.

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#include <Wire.h>
#include <LiquidCrystal_I2C.h>
uint8_t bell[8] = {0x4,0xe,0xe,0xe,0x1f,0x0,0x4};
uint8_t note[8] = {0x2,0x3,0x2,0xe,0x1e,0xc,0x0};
uint8_t clock[8] = {0x0,0xe,0x15,0x17,0x11,0xe,0x0};
uint8_t heart[8] = {0x0,0xa,0x1f,0x1f,0xe,0x4,0x0};
uint8_t duck[8] = {0x0,0xc,0x1d,0xf,0xf,0x6,0x0};
uint8_t check[8] = {0x0,0x1,0x3,0x16,0x1c,0x8,0x0};
uint8_t cross[8] = {0x0,0x1b,0xe,0x4,0xe,0x1b,0x0};
uint8_t retarrow[8] = { 0x1,0x1,0x5,0x9,0x1f,0x8,0x4};
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display
void setup()
{
lcd.init(); // initialize the lcd
lcd.backlight();
lcd.createChar(0, bell);
lcd.createChar(1, note);
lcd.createChar(2, clock);
lcd.createChar(3, heart);
lcd.createChar(4, duck);
lcd.createChar(5, check);
lcd.createChar(6, cross);
lcd.createChar(7, retarrow);
lcd.home();
lcd.print("Hello world...");
lcd.setCursor(0, 1);
lcd.print(" i ");
lcd.write(3);
lcd.print(" arduinos!");
delay(5000);
displayKeyCodes();
}
// display all keycodes
void displayKeyCodes(void) {
uint8_t i = 0;
while (1) {
lcd.clear();
lcd.print("Codes 0x"); lcd.print(i, HEX);
lcd.print("-0x"); lcd.print(i+16, HEX);
lcd.setCursor(0, 1);
for (int j=0; j<16; j++) {
lcd.write(i+j);
}
i+=16;
delay(4000);
}
}
void loop()
{
}

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#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 20 chars and 4 line display
void setup()
{
lcd.init(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
lcd.print("Hello, world!");
}
void loop()
{
}

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#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd1(0x26,16,2); // set the LCD address of the first lcd to 0x26 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd2(0x27,16,2); // set the LCD address of the second lcd to 0x27 for a 16 chars and 2 line display
void setup()
{
lcd1.init(); // initialize the first lcd
lcd2.init(); // initialize the second lcd
// Print a message on the first LCD.
lcd1.backlight();
lcd1.print("Hello, #1 world!");
// Print a message on the second LCD.
lcd2.backlight();
lcd2.print("Hello, #2 world!");
}
void loop()
{
}

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/*
* Displays text sent over the serial port (e.g. from the Serial Monitor) on
* an attached LCD.
*/
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display
void setup()
{
lcd.init(); // initialize the lcd
lcd.backlight();
Serial.begin(9600);
}
void loop()
{
// when characters arrive over the serial port...
if (Serial.available()) {
// wait a bit for the entire message to arrive
delay(100);
// clear the screen
lcd.clear();
// read all the available characters
while (Serial.available() > 0) {
// display each character to the LCD
lcd.write(Serial.read());
}
}
}

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[{000214A0-0000-0000-C000-000000000046}]
Prop3=19,2
[InternetShortcut]
URL=http://www.banggood.com/IIC-Or-I2C-Or-TWI-SPI-LCD1602-Character-LCD-Module-For-Arduino-p-88316.html?p=5G0704100426201212C9
IDList=

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[{000214A0-0000-0000-C000-000000000046}]
Prop3=19,2
[InternetShortcut]
URL=http://www.banggood.com/IIC-Or-I2C-2004-204-20-X-4-Character-LCD-Display-Module-Blue-p-908616.html?p=5G0704100426201212C9
IDList=

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[{000214A0-0000-0000-C000-000000000046}]
Prop3=19,2
[InternetShortcut]
URL=http://www.banggood.com/IIC-Or-I2C-Or-TWI-Or-SP-Serial-Interface-Module-Port-For-5V-Arduino-1602LCD-p-80365.html?p=5G0704100426201212C9
IDList=

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[{000214A0-0000-0000-C000-000000000046}]
Prop3=19,2
[InternetShortcut]
URL=http://www.banggood.com/IIC-Or-I2C-2004-204-20-X-4-Character-LCD-Display-Module-Yellow-Green-p-908821.html?p=5G0704100426201212C9
IDList=

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[{000214A0-0000-0000-C000-000000000046}]
Prop3=19,2
[InternetShortcut]
URL=http://playground.arduino.cc/Code/LCDi2c
IDList=
IconFile=http://playground.arduino.cc/favicon.png
IconIndex=1

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[{000214A0-0000-0000-C000-000000000046}]
Prop3=19,2
[InternetShortcut]
URL=http://playground.arduino.cc/Code/LCDAPI
IDList=

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// LiquidCrystal_I2C V2.0 - Mario H. atmega@xs4all.nl
// Mods for Chinese I2C converter board - Murray R. Van Luyn. vanluynm@iinet.net.au
The LiquidCrystal_I2C library is a modified version of the standard LiquidCrystal library as found on
the Arduino website.
This library is intended to be used when a parallel HD44780 compatible LCD is controlled over I2C using
a Chinese PCF8574 extender.
4 of the 8 outputs are used for LCD data lines 4 to 7.
4 outputs are used for the Enable, register-select, Read/Write and backlight control lines.
The Chinese PCF8574 extender is available in two versions, the PCF8574 and the PCF8574A.
The only difference between the two is the I2C base address.
The base address for the PCF8574 is 0x27 and the base address for the PCF8574A is 0x4E.
The examples included in this zip file assume the use of an PCF8574 set for address 0x27
(A0, A1 and A3 un-linked, so pulled high).
For PCF8574 the addressing is:
Jp3 Jp2 Jp1
A2 A1 A0 Dec Hex
L L L 32 0x20
L L H 33 0x21
L H L 34 0x22
L H H 35 0x23
H L L 36 0x24
H L H 37 0x25
H H L 38 0x26
H H H 39 0x27
For PCF8574A the addressing is:
Jp3 Jp2 Jp1
A2 A1 A0 Dec Hex
L L L 56 0x38
L L H 57 0x39
L H L 64 0x40
L H H 74 0x4A
H L L 75 0x4B
H L H 76 0x4C
H H L 77 0x4D
H H H 78 0x4E
For compatibility reasons this library contains some aliases for functions that are known under different
names in other libraries. This should make it fairly easy to implement the library in existing sketches
without changing to much code.
Functions not supported by this library will return nothing at all and in case a return value is expected
the function will return 0.

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###########################################
# Syntax Coloring Map For LiquidCrystal_I2C
# Version 2.0
###########################################
###########################################
# Datatypes (KEYWORD1)
###########################################
LiquidCrystal_I2C KEYWORD1
###########################################
# Methods and Functions (KEYWORD2)
###########################################
init KEYWORD2
begin KEYWORD2
clear KEYWORD2
home KEYWORD2
noDisplay KEYWORD2
display KEYWORD2
noBlink KEYWORD2
blink KEYWORD2
noCursor KEYWORD2
cursor KEYWORD2
scrollDisplayLeft KEYWORD2
scrollDisplayRight KEYWORD2
leftToRight KEYWORD2
rightToLeft KEYWORD2
shiftIncrement KEYWORD2
shiftDecrement KEYWORD2
noBacklight KEYWORD2
backlight KEYWORD2
autoscroll KEYWORD2
noAutoscroll KEYWORD2
createChar KEYWORD2
setCursor KEYWORD2
print KEYWORD2
blink_on KEYWORD2
blink_off KEYWORD2
cursor_on KEYWORD2
cursor_off KEYWORD2
setBacklight KEYWORD2
load_custom_character KEYWORD2
printstr KEYWORD2
###########################################
# Constants (LITERAL1)
###########################################

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/*
Copyright (c) 2007, Jim Studt (original old version - many contributors since)
The latest version of this library may be found at:
http://www.pjrc.com/teensy/td_libs_OneWire.html
OneWire has been maintained by Paul Stoffregen (paul@pjrc.com) since
January 2010. At the time, it was in need of many bug fixes, but had
been abandoned the original author (Jim Studt). None of the known
contributors were interested in maintaining OneWire. Paul typically
works on OneWire every 6 to 12 months. Patches usually wait that
long. If anyone is interested in more actively maintaining OneWire,
please contact Paul.
Version 2.2:
Teensy 3.0 compatibility, Paul Stoffregen, paul@pjrc.com
Arduino Due compatibility, http://arduino.cc/forum/index.php?topic=141030
Fix DS18B20 example negative temperature
Fix DS18B20 example's low res modes, Ken Butcher
Improve reset timing, Mark Tillotson
Add const qualifiers, Bertrik Sikken
Add initial value input to crc16, Bertrik Sikken
Add target_search() function, Scott Roberts
Version 2.1:
Arduino 1.0 compatibility, Paul Stoffregen
Improve temperature example, Paul Stoffregen
DS250x_PROM example, Guillermo Lovato
PIC32 (chipKit) compatibility, Jason Dangel, dangel.jason AT gmail.com
Improvements from Glenn Trewitt:
- crc16() now works
- check_crc16() does all of calculation/checking work.
- Added read_bytes() and write_bytes(), to reduce tedious loops.
- Added ds2408 example.
Delete very old, out-of-date readme file (info is here)
Version 2.0: Modifications by Paul Stoffregen, January 2010:
http://www.pjrc.com/teensy/td_libs_OneWire.html
Search fix from Robin James
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27
Use direct optimized I/O in all cases
Disable interrupts during timing critical sections
(this solves many random communication errors)
Disable interrupts during read-modify-write I/O
Reduce RAM consumption by eliminating unnecessary
variables and trimming many to 8 bits
Optimize both crc8 - table version moved to flash
Modified to work with larger numbers of devices - avoids loop.
Tested in Arduino 11 alpha with 12 sensors.
26 Sept 2008 -- Robin James
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27
Updated to work with arduino-0008 and to include skip() as of
2007/07/06. --RJL20
Modified to calculate the 8-bit CRC directly, avoiding the need for
the 256-byte lookup table to be loaded in RAM. Tested in arduino-0010
-- Tom Pollard, Jan 23, 2008
Jim Studt's original library was modified by Josh Larios.
Tom Pollard, pollard@alum.mit.edu, contributed around May 20, 2008
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Much of the code was inspired by Derek Yerger's code, though I don't
think much of that remains. In any event that was..
(copyleft) 2006 by Derek Yerger - Free to distribute freely.
The CRC code was excerpted and inspired by the Dallas Semiconductor
sample code bearing this copyright.
//---------------------------------------------------------------------------
// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
// Except as contained in this notice, the name of Dallas Semiconductor
// shall not be used except as stated in the Dallas Semiconductor
// Branding Policy.
//--------------------------------------------------------------------------
*/
#include "OneWire.h"
OneWire::OneWire(uint8_t pin)
{
pinMode(pin, INPUT);
bitmask = PIN_TO_BITMASK(pin);
baseReg = PIN_TO_BASEREG(pin);
#if ONEWIRE_SEARCH
reset_search();
#endif
}
// Perform the onewire reset function. We will wait up to 250uS for
// the bus to come high, if it doesn't then it is broken or shorted
// and we return a 0;
//
// Returns 1 if a device asserted a presence pulse, 0 otherwise.
//
uint8_t OneWire::reset(void)
{
IO_REG_TYPE mask = bitmask;
volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg;
uint8_t r;
uint8_t retries = 125;
noInterrupts();
DIRECT_MODE_INPUT(reg, mask);
interrupts();
// wait until the wire is high... just in case
do {
if (--retries == 0) return 0;
delayMicroseconds(2);
} while ( !DIRECT_READ(reg, mask));
noInterrupts();
DIRECT_WRITE_LOW(reg, mask);
DIRECT_MODE_OUTPUT(reg, mask); // drive output low
interrupts();
delayMicroseconds(480);
noInterrupts();
DIRECT_MODE_INPUT(reg, mask); // allow it to float
delayMicroseconds(70);
r = !DIRECT_READ(reg, mask);
interrupts();
delayMicroseconds(410);
return r;
}
//
// Write a bit. Port and bit is used to cut lookup time and provide
// more certain timing.
//
void OneWire::write_bit(uint8_t v)
{
IO_REG_TYPE mask=bitmask;
volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg;
if (v & 1) {
noInterrupts();
DIRECT_WRITE_LOW(reg, mask);
DIRECT_MODE_OUTPUT(reg, mask); // drive output low
delayMicroseconds(10);
DIRECT_WRITE_HIGH(reg, mask); // drive output high
interrupts();
delayMicroseconds(55);
} else {
noInterrupts();
DIRECT_WRITE_LOW(reg, mask);
DIRECT_MODE_OUTPUT(reg, mask); // drive output low
delayMicroseconds(65);
DIRECT_WRITE_HIGH(reg, mask); // drive output high
interrupts();
delayMicroseconds(5);
}
}
//
// Read a bit. Port and bit is used to cut lookup time and provide
// more certain timing.
//
uint8_t OneWire::read_bit(void)
{
IO_REG_TYPE mask=bitmask;
volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg;
uint8_t r;
noInterrupts();
DIRECT_MODE_OUTPUT(reg, mask);
DIRECT_WRITE_LOW(reg, mask);
delayMicroseconds(3);
DIRECT_MODE_INPUT(reg, mask); // let pin float, pull up will raise
delayMicroseconds(10);
r = DIRECT_READ(reg, mask);
interrupts();
delayMicroseconds(53);
return r;
}
//
// Write a byte. The writing code uses the active drivers to raise the
// pin high, if you need power after the write (e.g. DS18S20 in
// parasite power mode) then set 'power' to 1, otherwise the pin will
// go tri-state at the end of the write to avoid heating in a short or
// other mishap.
//
void OneWire::write(uint8_t v, uint8_t power /* = 0 */) {
uint8_t bitMask;
for (bitMask = 0x01; bitMask; bitMask <<= 1) {
OneWire::write_bit( (bitMask & v)?1:0);
}
if ( !power) {
noInterrupts();
DIRECT_MODE_INPUT(baseReg, bitmask);
DIRECT_WRITE_LOW(baseReg, bitmask);
interrupts();
}
}
void OneWire::write_bytes(const uint8_t *buf, uint16_t count, bool power /* = 0 */) {
for (uint16_t i = 0 ; i < count ; i++)
write(buf[i]);
if (!power) {
noInterrupts();
DIRECT_MODE_INPUT(baseReg, bitmask);
DIRECT_WRITE_LOW(baseReg, bitmask);
interrupts();
}
}
//
// Read a byte
//
uint8_t OneWire::read() {
uint8_t bitMask;
uint8_t r = 0;
for (bitMask = 0x01; bitMask; bitMask <<= 1) {
if ( OneWire::read_bit()) r |= bitMask;
}
return r;
}
void OneWire::read_bytes(uint8_t *buf, uint16_t count) {
for (uint16_t i = 0 ; i < count ; i++)
buf[i] = read();
}
//
// Do a ROM select
//
void OneWire::select(const uint8_t rom[8])
{
uint8_t i;
write(0x55); // Choose ROM
for (i = 0; i < 8; i++) write(rom[i]);
}
//
// Do a ROM skip
//
void OneWire::skip()
{
write(0xCC); // Skip ROM
}
void OneWire::depower()
{
noInterrupts();
DIRECT_MODE_INPUT(baseReg, bitmask);
interrupts();
}
#if ONEWIRE_SEARCH
//
// You need to use this function to start a search again from the beginning.
// You do not need to do it for the first search, though you could.
//
void OneWire::reset_search()
{
// reset the search state
LastDiscrepancy = 0;
LastDeviceFlag = FALSE;
LastFamilyDiscrepancy = 0;
for(int i = 7; ; i--) {
ROM_NO[i] = 0;
if ( i == 0) break;
}
}
// Setup the search to find the device type 'family_code' on the next call
// to search(*newAddr) if it is present.
//
void OneWire::target_search(uint8_t family_code)
{
// set the search state to find SearchFamily type devices
ROM_NO[0] = family_code;
for (uint8_t i = 1; i < 8; i++)
ROM_NO[i] = 0;
LastDiscrepancy = 64;
LastFamilyDiscrepancy = 0;
LastDeviceFlag = FALSE;
}
//
// Perform a search. If this function returns a '1' then it has
// enumerated the next device and you may retrieve the ROM from the
// OneWire::address variable. If there are no devices, no further
// devices, or something horrible happens in the middle of the
// enumeration then a 0 is returned. If a new device is found then
// its address is copied to newAddr. Use OneWire::reset_search() to
// start over.
//
// --- Replaced by the one from the Dallas Semiconductor web site ---
//--------------------------------------------------------------------------
// Perform the 1-Wire Search Algorithm on the 1-Wire bus using the existing
// search state.
// Return TRUE : device found, ROM number in ROM_NO buffer
// FALSE : device not found, end of search
//
uint8_t OneWire::search(uint8_t *newAddr)
{
uint8_t id_bit_number;
uint8_t last_zero, rom_byte_number, search_result;
uint8_t id_bit, cmp_id_bit;
unsigned char rom_byte_mask, search_direction;
// initialize for search
id_bit_number = 1;
last_zero = 0;
rom_byte_number = 0;
rom_byte_mask = 1;
search_result = 0;
// if the last call was not the last one
if (!LastDeviceFlag)
{
// 1-Wire reset
if (!reset())
{
// reset the search
LastDiscrepancy = 0;
LastDeviceFlag = FALSE;
LastFamilyDiscrepancy = 0;
return FALSE;
}
// issue the search command
write(0xF0);
// loop to do the search
do
{
// read a bit and its complement
id_bit = read_bit();
cmp_id_bit = read_bit();
// check for no devices on 1-wire
if ((id_bit == 1) && (cmp_id_bit == 1))
break;
else
{
// all devices coupled have 0 or 1
if (id_bit != cmp_id_bit)
search_direction = id_bit; // bit write value for search
else
{
// if this discrepancy if before the Last Discrepancy
// on a previous next then pick the same as last time
if (id_bit_number < LastDiscrepancy)
search_direction = ((ROM_NO[rom_byte_number] & rom_byte_mask) > 0);
else
// if equal to last pick 1, if not then pick 0
search_direction = (id_bit_number == LastDiscrepancy);
// if 0 was picked then record its position in LastZero
if (search_direction == 0)
{
last_zero = id_bit_number;
// check for Last discrepancy in family
if (last_zero < 9)
LastFamilyDiscrepancy = last_zero;
}
}
// set or clear the bit in the ROM byte rom_byte_number
// with mask rom_byte_mask
if (search_direction == 1)
ROM_NO[rom_byte_number] |= rom_byte_mask;
else
ROM_NO[rom_byte_number] &= ~rom_byte_mask;
// serial number search direction write bit
write_bit(search_direction);
// increment the byte counter id_bit_number
// and shift the mask rom_byte_mask
id_bit_number++;
rom_byte_mask <<= 1;
// if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask
if (rom_byte_mask == 0)
{
rom_byte_number++;
rom_byte_mask = 1;
}
}
}
while(rom_byte_number < 8); // loop until through all ROM bytes 0-7
// if the search was successful then
if (!(id_bit_number < 65))
{
// search successful so set LastDiscrepancy,LastDeviceFlag,search_result
LastDiscrepancy = last_zero;
// check for last device
if (LastDiscrepancy == 0)
LastDeviceFlag = TRUE;
search_result = TRUE;
}
}
// if no device found then reset counters so next 'search' will be like a first
if (!search_result || !ROM_NO[0])
{
LastDiscrepancy = 0;
LastDeviceFlag = FALSE;
LastFamilyDiscrepancy = 0;
search_result = FALSE;
}
for (int i = 0; i < 8; i++) newAddr[i] = ROM_NO[i];
return search_result;
}
#endif
#if ONEWIRE_CRC
// The 1-Wire CRC scheme is described in Maxim Application Note 27:
// "Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products"
//
#if ONEWIRE_CRC8_TABLE
// This table comes from Dallas sample code where it is freely reusable,
// though Copyright (C) 2000 Dallas Semiconductor Corporation
static const uint8_t PROGMEM dscrc_table[] = {
0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,
35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,
190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,
219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,
101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,
248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,
140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,
87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53};
//
// Compute a Dallas Semiconductor 8 bit CRC. These show up in the ROM
// and the registers. (note: this might better be done without to
// table, it would probably be smaller and certainly fast enough
// compared to all those delayMicrosecond() calls. But I got
// confused, so I use this table from the examples.)
//
uint8_t OneWire::crc8(const uint8_t *addr, uint8_t len)
{
uint8_t crc = 0;
while (len--) {
crc = pgm_read_byte(dscrc_table + (crc ^ *addr++));
}
return crc;
}
#else
//
// Compute a Dallas Semiconductor 8 bit CRC directly.
// this is much slower, but much smaller, than the lookup table.
//
uint8_t OneWire::crc8(const uint8_t *addr, uint8_t len)
{
uint8_t crc = 0;
while (len--) {
uint8_t inbyte = *addr++;
for (uint8_t i = 8; i; i--) {
uint8_t mix = (crc ^ inbyte) & 0x01;
crc >>= 1;
if (mix) crc ^= 0x8C;
inbyte >>= 1;
}
}
return crc;
}
#endif
#if ONEWIRE_CRC16
bool OneWire::check_crc16(const uint8_t* input, uint16_t len, const uint8_t* inverted_crc, uint16_t crc)
{
crc = ~crc16(input, len, crc);
return (crc & 0xFF) == inverted_crc[0] && (crc >> 8) == inverted_crc[1];
}
uint16_t OneWire::crc16(const uint8_t* input, uint16_t len, uint16_t crc)
{
static const uint8_t oddparity[16] =
{ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 };
for (uint16_t i = 0 ; i < len ; i++) {
// Even though we're just copying a byte from the input,
// we'll be doing 16-bit computation with it.
uint16_t cdata = input[i];
cdata = (cdata ^ crc) & 0xff;
crc >>= 8;
if (oddparity[cdata & 0x0F] ^ oddparity[cdata >> 4])
crc ^= 0xC001;
cdata <<= 6;
crc ^= cdata;
cdata <<= 1;
crc ^= cdata;
}
return crc;
}
#endif
#endif

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#ifndef OneWire_h
#define OneWire_h
#include <inttypes.h>
#if ARDUINO >= 100
#include "Arduino.h" // for delayMicroseconds, digitalPinToBitMask, etc
#else
#include "WProgram.h" // for delayMicroseconds
#include "pins_arduino.h" // for digitalPinToBitMask, etc
#endif
// You can exclude certain features from OneWire. In theory, this
// might save some space. In practice, the compiler automatically
// removes unused code (technically, the linker, using -fdata-sections
// and -ffunction-sections when compiling, and Wl,--gc-sections
// when linking), so most of these will not result in any code size
// reduction. Well, unless you try to use the missing features
// and redesign your program to not need them! ONEWIRE_CRC8_TABLE
// is the exception, because it selects a fast but large algorithm
// or a small but slow algorithm.
// you can exclude onewire_search by defining that to 0
#ifndef ONEWIRE_SEARCH
#define ONEWIRE_SEARCH 1
#endif
// You can exclude CRC checks altogether by defining this to 0
#ifndef ONEWIRE_CRC
#define ONEWIRE_CRC 1
#endif
// Select the table-lookup method of computing the 8-bit CRC
// by setting this to 1. The lookup table enlarges code size by
// about 250 bytes. It does NOT consume RAM (but did in very
// old versions of OneWire). If you disable this, a slower
// but very compact algorithm is used.
#ifndef ONEWIRE_CRC8_TABLE
#define ONEWIRE_CRC8_TABLE 1
#endif
// You can allow 16-bit CRC checks by defining this to 1
// (Note that ONEWIRE_CRC must also be 1.)
#ifndef ONEWIRE_CRC16
#define ONEWIRE_CRC16 1
#endif
#define FALSE 0
#define TRUE 1
// Platform specific I/O definitions
#if defined(__AVR__)
#define PIN_TO_BASEREG(pin) (portInputRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint8_t
#define IO_REG_ASM asm("r30")
#define DIRECT_READ(base, mask) (((*(base)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask) ((*((base)+1)) &= ~(mask))
#define DIRECT_MODE_OUTPUT(base, mask) ((*((base)+1)) |= (mask))
#define DIRECT_WRITE_LOW(base, mask) ((*((base)+2)) &= ~(mask))
#define DIRECT_WRITE_HIGH(base, mask) ((*((base)+2)) |= (mask))
#elif defined(__MK20DX128__)
#define PIN_TO_BASEREG(pin) (portOutputRegister(pin))
#define PIN_TO_BITMASK(pin) (1)
#define IO_REG_TYPE uint8_t
#define IO_REG_ASM
#define DIRECT_READ(base, mask) (*((base)+512))
#define DIRECT_MODE_INPUT(base, mask) (*((base)+640) = 0)
#define DIRECT_MODE_OUTPUT(base, mask) (*((base)+640) = 1)
#define DIRECT_WRITE_LOW(base, mask) (*((base)+256) = 1)
#define DIRECT_WRITE_HIGH(base, mask) (*((base)+128) = 1)
#elif defined(__SAM3X8E__)
// Arduino 1.5.1 may have a bug in delayMicroseconds() on Arduino Due.
// http://arduino.cc/forum/index.php/topic,141030.msg1076268.html#msg1076268
// If you have trouble with OneWire on Arduino Due, please check the
// status of delayMicroseconds() before reporting a bug in OneWire!
#define PIN_TO_BASEREG(pin) (&(digitalPinToPort(pin)->PIO_PER))
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint32_t
#define IO_REG_ASM
#define DIRECT_READ(base, mask) (((*((base)+15)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask) ((*((base)+5)) = (mask))
#define DIRECT_MODE_OUTPUT(base, mask) ((*((base)+4)) = (mask))
#define DIRECT_WRITE_LOW(base, mask) ((*((base)+13)) = (mask))
#define DIRECT_WRITE_HIGH(base, mask) ((*((base)+12)) = (mask))
#ifndef PROGMEM
#define PROGMEM
#endif
#ifndef pgm_read_byte
#define pgm_read_byte(addr) (*(const uint8_t *)(addr))
#endif
#elif defined(__PIC32MX__)
#define PIN_TO_BASEREG(pin) (portModeRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint32_t
#define IO_REG_ASM
#define DIRECT_READ(base, mask) (((*(base+4)) & (mask)) ? 1 : 0) //PORTX + 0x10
#define DIRECT_MODE_INPUT(base, mask) ((*(base+2)) = (mask)) //TRISXSET + 0x08
#define DIRECT_MODE_OUTPUT(base, mask) ((*(base+1)) = (mask)) //TRISXCLR + 0x04
#define DIRECT_WRITE_LOW(base, mask) ((*(base+8+1)) = (mask)) //LATXCLR + 0x24
#define DIRECT_WRITE_HIGH(base, mask) ((*(base+8+2)) = (mask)) //LATXSET + 0x28
#else
#error "Please define I/O register types here"
#endif
class OneWire
{
private:
IO_REG_TYPE bitmask;
volatile IO_REG_TYPE *baseReg;
#if ONEWIRE_SEARCH
// global search state
unsigned char ROM_NO[8];
uint8_t LastDiscrepancy;
uint8_t LastFamilyDiscrepancy;
uint8_t LastDeviceFlag;
#endif
public:
OneWire( uint8_t pin);
// Perform a 1-Wire reset cycle. Returns 1 if a device responds
// with a presence pulse. Returns 0 if there is no device or the
// bus is shorted or otherwise held low for more than 250uS
uint8_t reset(void);
// Issue a 1-Wire rom select command, you do the reset first.
void select(const uint8_t rom[8]);
// Issue a 1-Wire rom skip command, to address all on bus.
void skip(void);
// Write a byte. If 'power' is one then the wire is held high at
// the end for parasitically powered devices. You are responsible
// for eventually depowering it by calling depower() or doing
// another read or write.
void write(uint8_t v, uint8_t power = 0);
void write_bytes(const uint8_t *buf, uint16_t count, bool power = 0);
// Read a byte.
uint8_t read(void);
void read_bytes(uint8_t *buf, uint16_t count);
// Write a bit. The bus is always left powered at the end, see
// note in write() about that.
void write_bit(uint8_t v);
// Read a bit.
uint8_t read_bit(void);
// Stop forcing power onto the bus. You only need to do this if
// you used the 'power' flag to write() or used a write_bit() call
// and aren't about to do another read or write. You would rather
// not leave this powered if you don't have to, just in case
// someone shorts your bus.
void depower(void);
#if ONEWIRE_SEARCH
// Clear the search state so that if will start from the beginning again.
void reset_search();
// Setup the search to find the device type 'family_code' on the next call
// to search(*newAddr) if it is present.
void target_search(uint8_t family_code);
// Look for the next device. Returns 1 if a new address has been
// returned. A zero might mean that the bus is shorted, there are
// no devices, or you have already retrieved all of them. It
// might be a good idea to check the CRC to make sure you didn't
// get garbage. The order is deterministic. You will always get
// the same devices in the same order.
uint8_t search(uint8_t *newAddr);
#endif
#if ONEWIRE_CRC
// Compute a Dallas Semiconductor 8 bit CRC, these are used in the
// ROM and scratchpad registers.
static uint8_t crc8(const uint8_t *addr, uint8_t len);
#if ONEWIRE_CRC16
// Compute the 1-Wire CRC16 and compare it against the received CRC.
// Example usage (reading a DS2408):
// // Put everything in a buffer so we can compute the CRC easily.
// uint8_t buf[13];
// buf[0] = 0xF0; // Read PIO Registers
// buf[1] = 0x88; // LSB address
// buf[2] = 0x00; // MSB address
// WriteBytes(net, buf, 3); // Write 3 cmd bytes
// ReadBytes(net, buf+3, 10); // Read 6 data bytes, 2 0xFF, 2 CRC16
// if (!CheckCRC16(buf, 11, &buf[11])) {
// // Handle error.
// }
//
// @param input - Array of bytes to checksum.
// @param len - How many bytes to use.
// @param inverted_crc - The two CRC16 bytes in the received data.
// This should just point into the received data,
// *not* at a 16-bit integer.
// @param crc - The crc starting value (optional)
// @return True, iff the CRC matches.
static bool check_crc16(const uint8_t* input, uint16_t len, const uint8_t* inverted_crc, uint16_t crc = 0);
// Compute a Dallas Semiconductor 16 bit CRC. This is required to check
// the integrity of data received from many 1-Wire devices. Note that the
// CRC computed here is *not* what you'll get from the 1-Wire network,
// for two reasons:
// 1) The CRC is transmitted bitwise inverted.
// 2) Depending on the endian-ness of your processor, the binary
// representation of the two-byte return value may have a different
// byte order than the two bytes you get from 1-Wire.
// @param input - Array of bytes to checksum.
// @param len - How many bytes to use.
// @param crc - The crc starting value (optional)
// @return The CRC16, as defined by Dallas Semiconductor.
static uint16_t crc16(const uint8_t* input, uint16_t len, uint16_t crc = 0);
#endif
#endif
};
#endif

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#include <OneWire.h>
// OneWire DS18S20, DS18B20, DS1822 Temperature Example
//
// http://www.pjrc.com/teensy/td_libs_OneWire.html
//
// The DallasTemperature library can do all this work for you!
// http://milesburton.com/Dallas_Temperature_Control_Library
OneWire ds(10); // on pin 10 (a 4.7K resistor is necessary)
void setup(void) {
Serial.begin(9600);
}
void loop(void) {
byte i;
byte present = 0;
byte type_s;
byte data[12];
byte addr[8];
float celsius, fahrenheit;
if ( !ds.search(addr)) {
Serial.println("No more addresses.");
Serial.println();
ds.reset_search();
delay(250);
return;
}
Serial.print("ROM =");
for( i = 0; i < 8; i++) {
Serial.write(' ');
Serial.print(addr[i], HEX);
}
if (OneWire::crc8(addr, 7) != addr[7]) {
Serial.println("CRC is not valid!");
return;
}
Serial.println();
// the first ROM byte indicates which chip
switch (addr[0]) {
case 0x10:
Serial.println(" Chip = DS18S20"); // or old DS1820
type_s = 1;
break;
case 0x28:
Serial.println(" Chip = DS18B20");
type_s = 0;
break;
case 0x22:
Serial.println(" Chip = DS1822");
type_s = 0;
break;
default:
Serial.println("Device is not a DS18x20 family device.");
return;
}
ds.reset();
ds.select(addr);
ds.write(0x44, 1); // start conversion, with parasite power on at the end
delay(1000); // maybe 750ms is enough, maybe not
// we might do a ds.depower() here, but the reset will take care of it.
present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad
Serial.print(" Data = ");
Serial.print(present, HEX);
Serial.print(" ");
for ( i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
Serial.print(data[i], HEX);
Serial.print(" ");
}
Serial.print(" CRC=");
Serial.print(OneWire::crc8(data, 8), HEX);
Serial.println();
// Convert the data to actual temperature
// because the result is a 16 bit signed integer, it should
// be stored to an "int16_t" type, which is always 16 bits
// even when compiled on a 32 bit processor.
int16_t raw = (data[1] << 8) | data[0];
if (type_s) {
raw = raw << 3; // 9 bit resolution default
if (data[7] == 0x10) {
// "count remain" gives full 12 bit resolution
raw = (raw & 0xFFF0) + 12 - data[6];
}
} else {
byte cfg = (data[4] & 0x60);
// at lower res, the low bits are undefined, so let's zero them
if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
//// default is 12 bit resolution, 750 ms conversion time
}
celsius = (float)raw / 16.0;
fahrenheit = celsius * 1.8 + 32.0;
Serial.print(" Temperature = ");
Serial.print(celsius);
Serial.print(" Celsius, ");
Serial.print(fahrenheit);
Serial.println(" Fahrenheit");
}

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libraries/OneWire/examples/DS2408_Switch/DS2408_Switch.pde Normal file
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#include <OneWire.h>
/*
* DS2408 8-Channel Addressable Switch
*
* Writte by Glenn Trewitt, glenn at trewitt dot org
*
* Some notes about the DS2408:
* - Unlike most input/output ports, the DS2408 doesn't have mode bits to
* set whether the pins are input or output. If you issue a read command,
* they're inputs. If you write to them, they're outputs.
* - For reading from a switch, you should use 10K pull-up resisters.
*/
void PrintBytes(uint8_t* addr, uint8_t count, bool newline=0) {
for (uint8_t i = 0; i < count; i++) {
Serial.print(addr[i]>>4, HEX);
Serial.print(addr[i]&0x0f, HEX);
}
if (newline)
Serial.println();
}
void ReadAndReport(OneWire* net, uint8_t* addr) {
Serial.print(" Reading DS2408 ");
PrintBytes(addr, 8);
Serial.println();
uint8_t buf[13]; // Put everything in the buffer so we can compute CRC easily.
buf[0] = 0xF0; // Read PIO Registers
buf[1] = 0x88; // LSB address
buf[2] = 0x00; // MSB address
net->write_bytes(buf, 3);
net->read_bytes(buf+3, 10); // 3 cmd bytes, 6 data bytes, 2 0xFF, 2 CRC16
net->reset();
if (!OneWire::check_crc16(buf, 11, &buf[11])) {
Serial.print("CRC failure in DS2408 at ");
PrintBytes(addr, 8, true);
return;
}
Serial.print(" DS2408 data = ");
// First 3 bytes contain command, register address.
Serial.println(buf[3], BIN);
}
OneWire net(10); // on pin 10
void setup(void) {
Serial.begin(9600);
}
void loop(void) {
byte i;
byte present = 0;
byte addr[8];
if (!net.search(addr)) {
Serial.print("No more addresses.\n");
net.reset_search();
delay(1000);
return;
}
if (OneWire::crc8(addr, 7) != addr[7]) {
Serial.print("CRC is not valid!\n");
return;
}
if (addr[0] != 0x29) {
PrintBytes(addr, 8);
Serial.print(" is not a DS2408.\n");
return;
}
ReadAndReport(&net, addr);
}

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libraries/OneWire/examples/DS250x_PROM/DS250x_PROM.pde Normal file
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/*
DS250x add-only programmable memory reader w/SKIP ROM.
The DS250x is a 512/1024bit add-only PROM(you can add data but cannot change the old one) that's used mainly for device identification purposes
like serial number, mfgr data, unique identifiers, etc. It uses the Maxim 1-wire bus.
This sketch will use the SKIP ROM function that skips the 1-Wire search phase since we only have one device connected in the bus on digital pin 6.
If more than one device is connected to the bus, it will fail.
Sketch will not verify if device connected is from the DS250x family since the skip rom function effectively skips the family-id byte readout.
thus it is possible to run this sketch with any Maxim OneWire device in which case the command CRC will most likely fail.
Sketch will only read the first page of memory(32bits) starting from the lower address(0000h), if more than 1 device is present, then use the sketch with search functions.
Remember to put a 4.7K pullup resistor between pin 6 and +Vcc
To change the range or ammount of data to read, simply change the data array size, LSB/MSB addresses and for loop iterations
This example code is in the public domain and is provided AS-IS.
Built with Arduino 0022 and PJRC OneWire 2.0 library http://www.pjrc.com/teensy/td_libs_OneWire.html
created by Guillermo Lovato <glovato@gmail.com>
march/2011
*/
#include <OneWire.h>
OneWire ds(6); // OneWire bus on digital pin 6
void setup() {
Serial.begin (9600);
}
void loop() {
byte i; // This is for the for loops
boolean present; // device present var
byte data[32]; // container for the data from device
byte leemem[3] = { // array with the commands to initiate a read, DS250x devices expect 3 bytes to start a read: command,LSB&MSB adresses
0xF0 , 0x00 , 0x00 }; // 0xF0 is the Read Data command, followed by 00h 00h as starting address(the beginning, 0000h)
byte ccrc; // Variable to store the command CRC
byte ccrc_calc;
present = ds.reset(); // OneWire bus reset, always needed to start operation on the bus, returns a 1/TRUE if there's a device present.
ds.skip(); // Skip ROM search
if (present == TRUE){ // We only try to read the data if there's a device present
Serial.println("DS250x device present");
ds.write(leemem[0],1); // Read data command, leave ghost power on
ds.write(leemem[1],1); // LSB starting address, leave ghost power on
ds.write(leemem[2],1); // MSB starting address, leave ghost power on
ccrc = ds.read(); // DS250x generates a CRC for the command we sent, we assign a read slot and store it's value
ccrc_calc = OneWire::crc8(leemem, 3); // We calculate the CRC of the commands we sent using the library function and store it
if ( ccrc_calc != ccrc) { // Then we compare it to the value the ds250x calculated, if it fails, we print debug messages and abort
Serial.println("Invalid command CRC!");
Serial.print("Calculated CRC:");
Serial.println(ccrc_calc,HEX); // HEX makes it easier to observe and compare
Serial.print("DS250x readback CRC:");
Serial.println(ccrc,HEX);
return; // Since CRC failed, we abort the rest of the loop and start over
}
Serial.println("Data is: "); // For the printout of the data
for ( i = 0; i < 32; i++) { // Now it's time to read the PROM data itself, each page is 32 bytes so we need 32 read commands
data[i] = ds.read(); // we store each read byte to a different position in the data array
Serial.print(data[i]); // printout in ASCII
Serial.print(" "); // blank space
}
Serial.println();
delay(5000); // Delay so we don't saturate the serial output
}
else { // Nothing is connected in the bus
Serial.println("Nothing connected");
delay(3000);
}
}

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#######################################
# Syntax Coloring Map For OneWire
#######################################
#######################################
# Datatypes (KEYWORD1)
#######################################
OneWire KEYWORD1
#######################################
# Methods and Functions (KEYWORD2)
#######################################
reset KEYWORD2
write_bit KEYWORD2
read_bit KEYWORD2
write KEYWORD2
write_bytes KEYWORD2
read KEYWORD2
read_bytes KEYWORD2
select KEYWORD2
skip KEYWORD2
depower KEYWORD2
reset_search KEYWORD2
search KEYWORD2
crc8 KEYWORD2
crc16 KEYWORD2
check_crc16 KEYWORD2
#######################################
# Instances (KEYWORD2)
#######################################
#######################################
# Constants (LITERAL1)
#######################################