const int pinTombol = 3;
const int pinLED = 2;

int statusLED = LOW; 
int statusTombol; 
int statusTombolTerakhir = HIGH; 

unsigned long waktuDebounceTerakhir = 0; 
unsigned long delayDebounce = 50; 

void setup() {
  pinMode(pinTombol, INPUT); 
  pinMode(pinLED, OUTPUT); 
  digitalWrite(pinLED, statusLED);
}

void loop() {
  int bacaan = digitalRead(pinTombol); 

  if (bacaan != statusTombolTerakhir) { 
    waktuDebounceTerakhir = millis(); 
  }

  if ((millis() - waktuDebounceTerakhir) > delayDebounce) {
    if (bacaan != statusTombol) {
      statusTombol = bacaan;

      if (statusTombol == LOW) {
        statusLED = !statusLED;
      }
    }
  }

  digitalWrite(pinLED, statusLED);
  statusTombolTerakhir = bacaan;
}