// Define pin numbers
const int buttonPin = 2; // Push button pin
const int ledPin = 13;    // LED pin

// Variable to hold the LED state
volatile bool ledState = false;

// Function to handle the button press interrupt
void toggleLED() {
    ledState = !ledState; // Toggle the LED state
}

void setup() {
    // Initialize the LED pin as an output
    pinMode(ledPin, OUTPUT);
    // Initialize the button pin as an input with an internal pull-up resistor
    pinMode(buttonPin, INPUT_PULLUP);

    // Attach the interrupt to the button pin, triggering on the FALLING edge
    attachInterrupt(digitalPinToInterrupt(buttonPin), toggleLED, FALLING);
}

void loop() {
    // Set the LED state based on the ledState variable
    digitalWrite(ledPin, ledState ? HIGH : LOW);
}