const int buttonPin = 7;  // the number of the pushbutton pin
const int ledPin =  2;   // the number of the LED pin

// Variables
int buttonState = 0;        // variable for reading the pushbutton status
int countdown = 0;          // initial countdown time in seconds
bool countdownStarted = false; // flag to track if countdown has started

void setup() {
  pinMode(ledPin, OUTPUT);      // initialize the LED pin as an output
  pinMode(buttonPin, INPUT);    // initialize the pushbutton pin as an input
  Serial.begin(9600);           // initialize serial communication
}

void loop() {
  // read the state of the pushbutton value
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed and countdown hasn't started
  if (buttonState == HIGH && !countdownStarted) {
    countdownStarted = true; // mark countdown as started
    countdown = 10;          // set initial countdown time
  }

  // if countdown has started, decrement countdown time
  if (countdownStarted) {
    // print the countdown time
    Serial.println(countdown);

    // check if countdown reaches zero
    if (countdown == 0) {
      // turn on the LED
      digitalWrite(ledPin, HIGH);
      countdownStarted = false; // stop the countdown
    } else {
      // decrement countdown time
      countdown--;

      // wait for a second
      delay(1000);
    }
  }
}