// Define pin numbers
const int buttonPin = 9; // Button connected to digital pin 2
const int ledPin = 7;   // LED connected to digital pin 13

// Variables
int buttonState = 0;     // Variable to store the button state
int lastButtonState = 0; // Variable to store the last button state
int counter = 0;         // Counter for button presses

unsigned long debounceDuration = 50; // Debounce duration in milliseconds
unsigned long lastTimeButtonStateChanged = 0; // Last time button state was changed

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

  digitalWrite(ledPin, LOW);        // Initial state: LED off

  Serial.begin(9600);               // Start serial communication
}

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

  // Check if the button has been pressed (transition from HIGH to LOW)
  if (millis() - lastTimeButtonStateChanged > debounceDuration) {
    if (buttonState == LOW && lastButtonState == HIGH) {
      // Button has been pressed
      counter++;
      delay(2000);

      Serial.print("Counter: ");
      Serial.print(counter);

      Serial.print(" << EventNumber: ");
      Serial.println(counter%2);

      // Check if the counter value is even
      if (counter % 2 == 0) {
        digitalWrite(ledPin, HIGH); // Turn on the LED if the counter is even
      } else {
        digitalWrite(ledPin, LOW);  // Turn off the LED if the counter is odd
      }

      lastTimeButtonStateChanged = millis(); // Update the last time button state changed
    }
    lastButtonState = buttonState; // Save the button state for the next loop iteration
  }
}