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

volatile bool ledState = false;

void toggleLED() {
    ledState = !ledState; 
}

void setup() {
    
    pinMode(ledPin, OUTPUT);
    
    pinMode(buttonPin, INPUT_PULLUP);

   attachInterrupt(digitalPinToInterrupt(buttonPin),toggleLED, FALLING);
}

void loop() {
    
    digitalWrite(ledPin, ledState ? HIGH : LOW);
}