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nearly final version of my LM35LCD project... :)

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Johannes Findeisen 2015-08-16 03:29:42 +02:00
commit a09c431069
2 changed files with 55 additions and 19 deletions
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74
LM35LCD/LM35LCD.ino
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@ -1,37 +1,52 @@
// Written 2015 by Johannes Findeisen <you@hanez.org>
#include <LiquidCrystal.h>
// Initialize the LCD code. Take care of the pins I use. The first two pins
// are 12 and 11 in most examples around the web. I use pin 7 and 6 because of
// nicer wiring on my breadboard.
// Read this for more information:
// https://www.arduino.cc/en/Tutorial/LiquidCrystal
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
int samples[30];
float tempC;
// 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 = 30;
// Collect delay between each sample.
int collectDelay = 2000;
// 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;
int tempPin = 0;
float tempF = 0;
void setup() {
pinMode(13, OUTPUT);
pinMode(ledPin, OUTPUT);
lcd.begin(16, 2);
lcd.print("Temperature:");
lcd.setCursor(0, 1);
tempC = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;
tempF = (tempC * 9) / 5 + 32;
lcd_print();
}
void loop() {
int i;
tempC = 0;
for(i = 0; i <= 29; i++) {
samples[i] = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;
tempC = tempC + samples[i];
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
tempC = tempC / 30.0;
tempF = (tempC*9) / 5 + 32;
// Prints results to the display
void lcd_print() {
lcd.setCursor(0, 1);
lcd.print(tempC);
lcd.print((char)223);
lcd.print("C/");
lcd.print(tempF);
lcd.print("F ");
lcd.print((char)223);
lcd.print("F");
if(tempClast > tempC) {
lcd.print("-");
} else if(tempClast < tempC) {
@ -39,5 +54,26 @@ void loop() {
} else {
lcd.print("*");
}
}
void loop() {
int i;
tempC = 0;
for(i = 0; i <= (samples - 1); i++) {
// Read this to understand the temperature calculation:
// http://www.danielandrade.net/2008/07/05/temperature-sensor-arduino/
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 cobversation
tempF = (tempC * 9) / 5 + 32;
// Print result to the display
lcd_print();
// Remember current temperature for next run
tempClast = tempC;
}