#define BUTTON_PIN 5  // GPIO for the button
#define BUZZER_PIN 4  // GPIO for the buzzer

volatile bool buzzerState = false;  // Shared variable to track buzzer state

void IRAM_ATTR handleButtonPress() {
  // Toggle the buzzer state
  buzzerState = !buzzerState;
  digitalWrite(BUZZER_PIN, buzzerState);
}

void setup() {
  // Set pin modes
  pinMode(BUTTON_PIN, INPUT_PULLUP);  // Enable internal pull-up resistor
  pinMode(BUZZER_PIN, OUTPUT);

  // Attach interrupt to the button pin
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), handleButtonPress, FALLING);
}

void loop() {
  // Main loop does nothing, interrupt handles the buzzer
}