reading temperature from SA56004ED temperature sensor http://tinkeringetc.blogspot.com/

SA56004ED_temp.ino

// reading temperature from SA56004ED temperature sensor
// http://tinkeringetc.blogspot.com/

#include <Wire.h>

#define SA56004ED 0x4C // SA56004ED temperature sensor device address
#define LTHB 0x00 // local temperature high byte register address
#define LTLB 0x22 // local temperature high byte register address

float lthb, ltlb; // local temperature low and high bytes
float tempC, tempF; // temperatures in Celcius and Farenheit

void setup()
{
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
}

void loop()
{
  // get local temperature high byte
  Wire.beginTransmission(SA56004ED); //Start talking to SA56004ED
  Wire.write(LTHB); //Ask for Register for local temperature high byte
  Wire.endTransmission(); //Complete Transmission
  Wire.requestFrom(SA56004ED, 1);    // request 1 byte from SA56004ED
  while(Wire.available())    // slave may send less than requested
  { 
    lthb = Wire.read(); // receive the local temperature high byte
  }
  
  // get local temperature low byte
  Wire.beginTransmission(SA56004ED); //Start talking to SA56004ED
  Wire.write(LTLB); //Ask for Register zero
  Wire.endTransmission(); //Complete Transmission
  Wire.requestFrom(SA56004ED, 1);    // request 1 byte from slave device #0
  while(Wire.available())    // slave may send less than requested
  { 
    ltlb = Wire.read(); // receive the local temperature low byte
  }

  // ltlb = xxx0 0000
  // shift 8 places to the right to make it a decimal
  // ltlb = 0.xxx
  // ltlb / (2^8) == ltlb >> 8 [but you can't shift bits in a float]
  ltlb = ltlb / pow(2, 8);
 
  tempC = lthb + ltlb;
  tempF = ((tempC*9)/5)+32; // convert Celcius to Farenheit
  Serial.println(tempF);
  Serial.println();
  delay(500);
}