Pravar93

• 

  Product SEN-09570 about 10 years ago

  We've struggled quite a bit to establish communication between an Arduino UNO and MLX90614AAA using the Wire Library for I2C. We finally got it running though. Here's the sketch!

  /*******************************************
  Title: MLX90614 driver for Arduino
  Author: Varun Nalam & Pravar Jain
  *******************************************/
  
  #include <Wire.h>  //Including Wire library to communicate using I2C protocol//
  
  int device=0x5A;  //MLX90614 device address//
  byte buffer[3];  //3 bytes buffer for data read from the device (data_high, data_low and pec)//
  float temp;  //Variable storing the temperature data acquired//
  
  //---------------- Functions ----------------//
  
  //Read data function//
  void readFrom(int device, byte address, int num)
   {
     Wire.beginTransmission(device);  //Start transmission to device (Initiating again)//
     Wire.write(address);  //RAM address for ambient or object temperature//
     Wire.endTransmission(false);  //To make sure bus is not released, restart message given out//
     Wire.requestFrom(device, num);  //Request 3 bytes of data from device//
  
     int i = 0;
     while(Wire.available())  //Device may send less than requested (abnormal)//
     { 
        buffer[i] = Wire.read();  //Receive a byte//
         i++;
      }
      Wire.endTransmission();  //End transmission and release bus//
    }
  
  //Write data function//
  void writeTo(int device, byte address)
  {
    Wire.beginTransmission(device);  //Start transmission to device//
    Wire.write(address);  //Send register address//
    Wire.endTransmission();  //End transmission//
   }
  
  //---------------------------------------------//
  
  void setup()
  {
    Serial.begin(57600);  //Serial for output//
    Wire.begin();  //Joining i2c bus//
  }
  //End of setup//
  
  void loop() 
  {
    int address=0x07;  //Choosing RAM address for ambient or object temperature//
    readFrom(device,address,3);  //Read the raw temperature data and PEC from the MLX90614//
    temp=(buffer[1]<<8)|(buffer[0]);  //Adjusting the two bytes of temperature data//
    temp = (temp * 0.02)-0.01;
    temp = temp - 273.15;
  
    Serial.print("Celcius: ");
    Serial.println(temp);
  
    delay(100);
  }
  

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