#define PHOTO_PIN PA0   
#define SPEAKER_PIN PB6 
#define BUTTON_PIN PA1  

bool soundEnabled = true;
bool lastButtonState = HIGH;
bool currentButtonState = HIGH;
unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 50;

void setup() {
  pinMode(PHOTO_PIN, INPUT_ANALOG);
  pinMode(SPEAKER_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
 
  Serial.begin(9600);
}

void loop() {
  bool reading = digitalRead(BUTTON_PIN);
  
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }
  
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != currentButtonState) {
      currentButtonState = reading;
      
      if (currentButtonState == LOW) {
        soundEnabled = !soundEnabled;
        Serial.print("Sound ");
        Serial.println(soundEnabled ? "ON" : "OFF");
       
        if (!soundEnabled) {
          noTone(SPEAKER_PIN);
        }
      }
    }
  }
  
  lastButtonState = reading;
  
  if (soundEnabled) {
    int lightValue = analogRead(PHOTO_PIN);
    
    int frequency = map(lightValue, 0, 4095, 100, 2000);
  
    tone(SPEAKER_PIN, frequency);
  
    Serial.print("Light: ");
    Serial.print(lightValue);
    Serial.print(" | Freq: ");
    Serial.print(frequency);
    Serial.println(" Hz");
  }
  delay(10);
}