gistfile1.ino

#include <Wire.h>


void setup()
{
  Wire.begin(1);    //declare device address here
  Wire.onReceive (beHappy);   //acts as interrupt and executed function
  Serial.begin(9600);
}

void loop()
{
  delay(100);  
}

void beHappy(int data){  //function expects one parameter

  while(1 < Wire.available())
  {
    char c = Wire.read();
    Serial.print(c);
  }
  
  byte x = Wire.read();
  Serial.println(x);
  
}