//definisikan variabel ke pin
#define relay 23 //pin 23

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(relay, OUTPUT);

}

void loop() {
 // led akan menyala dan mati selama 2 detik
digitalWrite(relay, HIGH);
delay(2000);
digitalWrite(relay, LOW);
delay(2000);
}