int LED = 7; //Led terhubung ke kaki 7 Arduino
int btn = 5; //pushbutton terhubung ke kaki 5 Arduino

void setup() {
  // put your setup code here, to run once:
  pinMode(LED, OUTPUT); // set Pin Butt
  pinMode(btn, INPUT_PULLUP);
  digitalWrite(LED, LOW);

}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(btn) == LOW){
  digitalRead(LED, HIGH);
  delay(3000);
  digitalWrite(LED, LOW);
  }
}