#define LED_PIN D8 // Change according to your connection

void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  if (Serial.available() > 0) {
    char received = Serial.read();
    if (received == '1') {
      digitalWrite(LED_PIN, HIGH); // Turn LED on
    } else if (received == '0') {
      digitalWrite(LED_PIN, LOW); // Turn LED off
    }
  }
}