#include <Arduino.h>
#include <Wire.h>

const unsigned char ADDR = 0b1001000;
unsigned char integer = 0;

void read_temp(int address);

unsigned char lowValue = 0, highValue = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Wire.begin();
}

void loop() {
  delay(1000);
  read_temp(ADDR);

  // Serial.print(F("Raw value: ")); Serial.print(highValue); Serial.print(F(" ")); Serial.println(lowValue);
  if (highValue & 0b10000000)
  {
    Serial.print(F("-"));
    integer = highValue & 0b01111111;
    integer = highValue ^ 0xFF;
    integer += 1;
  }
  else
  {
    integer = highValue;
  }

  Serial.print(integer);
  if (lowValue & 0b10000000)
  {
    Serial.print(F(".5"));
  }
  Serial.println("");
}

void read_temp(int address)
{
  //start the communication with IC with the address xx
  Wire.beginTransmission(address);
  //send a bit and ask for register zero
  Wire.write(0);
  //end transmission
  Wire.endTransmission();
  //request 1 byte from address xx
  Wire.requestFrom(address, 2);
  //wait for response
  while (Wire.available() == 0);
  //put the temperature in variable c
  highValue = Wire.read();
  lowValue = Wire.read();
}