const int S1 = 11;
const int S2 = 10;
const int D1 = 7;
const int D2 = 6;

bool statusS2 = false;   // status LED D2 (toggle)
bool lastS2 = HIGH;      // status terakhir tombol S2

void setup() {
  pinMode(S1, INPUT_PULLUP);
  pinMode(S2, INPUT_PULLUP);
  pinMode(D1, OUTPUT);
  pinMode(D2, OUTPUT);
}

void loop() {
  // S1 dikendalikan langsung (on saat ditekan)
  if (digitalRead(S1) == LOW) {
    digitalWrite(D1, HIGH);
  } else {
    digitalWrite(D1, LOW);
  }

  // S2 dikendalikan secara toggle
  bool currentS2 = digitalRead(S2);
  if (lastS2 == HIGH && currentS2 == LOW) { // Deteksi jatuh (falling edge)
    statusS2 = !statusS2; // toggle status
    digitalWrite(D2, statusS2 ? HIGH : LOW);
  }
  lastS2 = currentS2;
}