/*==============================================================
ButtonDuino Temperature Read to LabVIEW
Created      : 13 December 2013
Created By   : Lumina Inova
Description  : Reads 12 bit Temperature through I2C
               and sends it through HID to LabVIEW
               Interface.
Connections  : SDA => BtnDuino D0 to TMP102  SDA
               SCL => BtnDuino D2 to TMP102  SCL
               PWR => BtnDuino VCC to TMP102 VCC
               GND => BtnDuino GND to TMP102 GND  
               ADD  => TMP102 ADDRESS to GND 
Tutorial :     http://www.i-m.co/reigngt09/ButtonDuinoWiki/
==============================================================*/

#include <TinyWireM.h>    
#include "DigiKeyboard.h"

int sensorAddress = 0x91 >> 1;    //Address of TMP102 Temperature Sensor 


byte msb;
byte lsb;
int temperature;

void setup(void)
{
   TinyWireM.begin();  
}
 
void loop(){

 DigiKeyboard.delay(50);
 TinyWireM.requestFrom(sensorAddress,2);

 
 if (2 <= TinyWireM.available())               // if two bytes were received 
  {
    msb = TinyWireM.receive();                 // receive high byte (full degrees)
    lsb =  TinyWireM.receive();                // receive low byte (fraction degrees) 
    
    temperature = ((msb) << 4);                // MSB
    temperature |= (lsb >> 4);                 // LSB
    DigiKeyboard.sendKeyStroke(0);             //Activate Read

    DigiKeyboard.println(temperature*0.0625);  //Display Temperature * Calibration Constant
    
 
  }
   DigiKeyboard.delay(1000);                     //Delay so PC knows the connection is alive
}