#include <Wire.h>

#define led_pin 8
//#define I2C_SLAVE_ADDR (1)

void setup() {
  pinMode(led_pin,OUTPUT);
  Wire.begin(1);
}

void loop() {
  volatile byte msg = 0;
      msg = Wire.read();
      if(msg==1){
          digitalWrite(led_pin,HIGH);
          delay(100);
        }
       else{
        digitalWrite(led_pin,LOW);
        delay(100);
        }

}