Controlling AC Light (C/C++) - Wokwi ESP32, STM32, Arduino Simulator

int relayPin = 23;

void setup() {
  pinMode(relayPin, OUTPUT);
}

void loop() {
  digitalWrite(relayPin, HIGH); // bật relay
  delay(2000);

  digitalWrite(relayPin, LOW); // tắt relay
  delay(2000);
}