#include <Wire.h>
int x = 0;
int BUTTON = 3;

void setup() {
pinMode(BUTTON,INPUT); 
Wire.begin(); 
// Start the I2C Bus as Master
}
void loop() {
if(digitalRead(BUTTON) == HIGH)
  {
  x=1;
  }else
  {
  x=0;  
  }
Wire.beginTransmission(1); // transmit to device #1
Wire.write(x); // transmit x 
Wire.endTransmission(); // stop transmitting
delay(500);
}