งานที่ 14 Arduino As A Thermometer

Hardware

Sorfware

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

// Set the LCD to address 0x27, 16 chars, and 2 lines.
LiquidCrystal_I2C lcd(0x27,16,2);

void setup()
{
  lcd.init();
  lcd.backlight();
}

void loop()
{
  char str[16];
  double degC, degF;

  // Read the LM35 sensor on A3.
  int adu = analogRead(A3);

  // Calculate the temperature.
  degC = adu * 0.488;
  degF = (adu * 0.8784) + 32;

  // Turn it into a string.
  memset(str, 0, sizeof(str));
  dtostrf(degC,1,2,str);
  strcat(str, " C ");
  dtostrf(degF,1,2,str+(strlen(str)));
  strcat(str, " F");

  // Display the header and the string.
  lcd.setCursor(0,0);
  lcd.print("Temperature");
  lcd.setCursor(0,1);
  lcd.print(str);

  delay(1000);
}