int pushbutton = 12; //pin pushbutton
int led1 = 9; // pin LED 1
int led2 = 5; // pin LED 2
int led3 = 4; // pin LED 3

void setup(){
  // put your setup code here, to run once:
  pinMode(pushbutton, INPUT_PULLUP);
pinMode(Led1, OUTPUT); // set pin LED sebagai OUTPUT 
pinMode(led2, OUTPUT); // set pin LED sebagai OUTPUT 
pinMode(lef3, OUTPUT); // set pin LED sebagai OUTPUT 
}

void loop() {
  // put your main code here, to run repeatedly:
 if(digitalRead(pushbutton)== LOW) { // jika tombol ditekan
 digitalWrite(led1, HIGH); // menghidupkan led
 digitalWrite(led2, LOW); // mematikan led
 digitalWrite(led3, LOW); // mematikan led
 delay(300); // tunda 3 detik
 digitalWrite(led1, LOW); // mematikan led
 digitalWrite(led2, HIGH); // menghidupkan led
 digitalWrite(led3, LOW); // mematikan led
 delay(300); // tunda 3 detik
 digitalWrite(led1, LOW); // mematikan led
 digitalWrite(led2, LOW); // mematikan led
 digitalWrite(led3, HIGH); // menghidupkan led
 delay(300); // tunda 3 detik
 digitalWrite(led1, LOW); // mematikan led
 digitalWrite(led2, LOW); // mematikan led
 digitalWrite(led3, LOW); // mematikan led

 }
}