//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);
}