// 9 задание
void setup() {
  pinMode(2, INPUT_PULLUP);
  pinMode(13, OUTPUT);
}
bool timerActive = false;                 
unsigned long timerStartTime = 0;         
bool manualOverride = false;              
bool wasLight = false;

void loop() {
  int lightLevel = analogRead(A0);
  int buttonState = digitalRead(2);
  
  if (buttonState == LOW) {
    timerActive = false;
    manualOverride = true;
    wasLight = false;
    digitalWrite(13, LOW);
    delay(500);
    return;
  }
  
  bool isLightNow = (lightLevel >= 300);
  if (isLightNow && !wasLight && !timerActive && !manualOverride) {
    timerActive = true;
    timerStartTime = millis();
    digitalWrite(13, HIGH);
  }
  
  wasLight = isLightNow;
  
  if (timerActive) {
    unsigned long elapsedTime = millis() - timerStartTime;
    if (lightLevel < 300) {
      timerActive = false;
      digitalWrite(13, LOW);
    }
    else if (elapsedTime >= 3000) {
      timerActive = false;
      digitalWrite(13, LOW);
      manualOverride = true;
    }
  }
  if (manualOverride && lightLevel < 300) {
    manualOverride = false;
  }
  
  delay(100);
}