#include <Wire.h>
#define ADDRESS 0x8
#define TEMP_TYPE 1

void requestEvent();
void receiveEvent();

byte temp = 24;
byte unitType = 0;

void setup() {
  // put your setup code here, to run once:
  Wire.begin(ADDRESS);
  Wire.onReceive(receiveEvent);
  Wire.onRequest(requestEvent);

}

void loop() {
  // put your main code here, to run repeatedly:

}


void receiveEvent(int howmany)
{
  String cmd = "";
   
   //UNIT0 -5 byte
  while(1 < Wire.available())
  {
    char c = Wire.read();
    cmd.concat(c);
  }
  Serial.println(cmd);
  if(cmd == "UNIT") unitType = Wire.read();
  cmd = "";
}
void requestEvent()
{
  switch(unitType)
  {
    case 0:
      Wire.write(temp);
      break;
    case 1:
      Wire.write(byte((temp*1.8) + 32));
      break;
    default:
      break;
  }
}