92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
#include <Wire.h>
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#include <LiquidCrystal_I2C.h>
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LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 20 chars and 4 line display
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// Define how many samples should be collected every $collectDelay miliseconds.
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// After sample collection the temperature is beeing calculated and then
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// send to the LCD.
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int samples = 16;
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// Collect delay between each sample.
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int collectDelay = 2000;
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// The pin where the status LED is connected to.
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int ledPin = 13;
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// The analog input pin where the LM35 is connected to.
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int tempPin = 0;
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// Just some variable initializations.
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float tempC = 0;
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float tempClast = 0;
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float tempF = 0;
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void setup()
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{
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/*lcd.init();
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lcd.autoscroll();
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lcd.setCursor(2, 0);
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lcd.backlight();
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lcd.print("Hello, world! asd as d as d asd");
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lcd.setCursor(0, 1);
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lcd.print("Hello, world2");
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*/
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pinMode(ledPin, OUTPUT);
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lcd.init();
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lcd.backlight();
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// Get data for the first time.
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// Read this to understand the temperature calculation:
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// http://www.danielandrade.net/2008/07/05/temperature-sensor-arduino/
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tempC = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;
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tempClast = tempC;
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// Celsius to Fahrenheit conversion
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tempF = (tempC * 9) / 5 + 32;
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// Refresh the LCD output
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lcd_refresh();
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}
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void loop()
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{
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int i;
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tempC = 0;
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for (i = 0; i <= (samples - 1); i++) {
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tempC = tempC + ((5.0 * analogRead(tempPin) * 100.0) / 1024.0);
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digitalWrite(ledPin, HIGH);
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delay((collectDelay / 2));
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digitalWrite(ledPin, LOW);
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delay((collectDelay / 2));
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}
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// Calculate temperature
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tempC = tempC / (float)samples;
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// Celsius to Fahrenheit conversion.
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tempF = (tempC * 9) / 5 + 32;
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// Print results to the display.
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lcd_refresh();
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// Remember current temperature for next run.
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tempClast = tempC;
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}
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// Prints results to the display
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void lcd_refresh() {
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lcd.setCursor(0, 0);
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lcd.print("Temperature");
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lcd.print((char)40); // ASCII code 40 = "("
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if (tempClast > tempC) {
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lcd.print((char)60); // ASCII code 60 = "<"
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} else if (tempClast < tempC) {
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lcd.print((char)62); // ASCII code 62 = ">"
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} else {
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lcd.print((char)61); // ASCII code 61 = "="
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}
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lcd.print((char)41); // ASCII code 41 = ")"
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lcd.print((char)58); // ASCII code 58 = ":"
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lcd.setCursor(0, 1);
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lcd.print(tempC);
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lcd.print((char)223); // ASCII code 223 = "°"
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lcd.print("C/");
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lcd.print(tempF);
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lcd.print((char)223); // ASCII code 223 = "°"
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lcd.print("F");
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}
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