#define led    13
#define tombol 25

void setup() {
  // put your setup code here, to run once:
  pinMode(led,OUTPUT);
  pinMode(tombol, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  if(digitalRead(tombol)==LOW) {
    for(int i=0;i<100;i++) {
      digitalWrite(led,HIGH); delay(500);
      digitalWrite(led,LOW); delay(500);
    }
  } 
}