Kammi on SEN-09570 - Infrared Thermometer - MLX90614

I really wanted to use this sensor with a Teensy 3.0 (ARM based) board, but all the working code I could find uses the i2cmaster library and is dependent on the microcontroller being AVR based. I never used I2C before this project so I still can’t get it to run in PWM mode, but I did manage to get the sensor to communicate successfully using Wire.h included in Arduino 1.0.5 and print a readable temperature using some code from the bildr tutorial. I hope this will be of help to someone.

#include Wire.h
#define LED_pin 13
#define slaveAddress 0x00

void setup(){

  // An LED will blink to indicate when we have successfully read the temperature
  pinMode(LED_pin, OUTPUT);
  digitalWrite(LED_pin, LOW);
  Wire.begin();
}

void loop(){

  // Store the two relevant bytes of data for temperature
  byte dataLow = 0x00;
  byte dataHigh = 0x00;

  Wire.beginTransmission(slaveAddress);
  delay(10);

  Wire.write(0x07);    // This is the command to view object temperature in the sensor's RAM
  delay(10);

  Wire.endTransmission(false);
  delay(10);

  Wire.requestFrom(slaveAddress, 2);
  delay(10);

  while (Wire.available()){
    dataLow = Wire.read();
    dataHigh = Wire.read();
    digitalWrite(13, HIGH);    // Blink the LED to indicate a successful reading
  }
  delay(10);

  digitalWrite(13, LOW);


  double tempFactor = 0.02; // 0.02 degrees per LSB (measurement resolution of the MLX90614)
  double tempData = 0x0000; // zero out the data
  int frac; // data past the decimal point

  // This masks off the error bit of the high byte, then moves it left 8 bits and adds the low byte.
  tempData = (double)(((dataHigh & 0x007F)
  tempData = (tempData * tempFactor)-0.01;

  float celcius = tempData - 273.15;
  float fahrenheit = (celcius*1.8) + 32;

  Serial.print(fahrenheit);
  Serial.println(" F");

  delay(100);
}