#include <Wire.h >
    #define led 10
    int d1=0;
    
    void setup() {
        pinMode(led, OUTPUT);
        Serial.begin(9600);
        Wire.begin(8); // change address
        Wire.onReceive(receiveEvent);
    }
    
    void loop() {
        if (d1 == 1) {
        digitalWrite(led, HIGH);
        } else {
        digitalWrite(led, LOW);
        }
        delay(500);
    }
    
    void receiveEvent(int howMany) {
        while (Wire.available()) {
        d1 = Wire.read();
        }
    }