#include <Wire.h>

#define SLAVE_ADDR 0x09 
#define LED_PIN 0       

void setup() {
  pinMode(LED_PIN, OUTPUT);
  Wire.begin(SLAVE_ADDR); 
  Wire.onReceive(receiveEvent); 
}

void loop() {
  
}

void receiveEvent(int bytes) {
  while (Wire.available()) {
    int command = Wire.read();
    if (command == 1) {
      digitalWrite(LED_PIN, HIGH);
      delay(1000); 
      digitalWrite(LED_PIN, LOW);
    }
  }
}