int ledPin = 13;          // Pin for the LED
int buzzerPin = 9;        // Pin for the buzzer
int buttonPin = 1;        // Pin for the button

void setup() {
  pinMode(ledPin, OUTPUT);  // Set LED pin as output
  pinMode(buzzerPin, OUTPUT); // Set buzzer pin as output
  pinMode(buttonPin, INPUT_PULLUP); // Set button pin as input with internal pull-up resistor
}

int nowButtonState, oldButtonState = HIGH;  // Button state variables

void loop() {
  nowButtonState = digitalRead(buttonPin);  // Read the button state

  // Check if the button was pressed (transition from HIGH to LOW)
  if (nowButtonState == LOW && oldButtonState == HIGH) {
    digitalWrite(ledPin, !digitalRead(ledPin)); // Toggle LED state

    // If LED is ON, turn on the buzzer
    if (digitalRead(ledPin) == HIGH) {
      tone(buzzerPin, 1000); // Start buzzer with 1kHz frequency
    } 
    // If LED is OFF, turn off the buzzer
    else {
      noTone(buzzerPin); // Stop the buzzer
    }
  }

  delay(10);  // Small delay for debouncing
  oldButtonState = nowButtonState; // Update the old button state
}