/*
Materials:
LED
Resistor 220Ω
Push button switch

1. Connect LED anode to digital pin 9 of the arduino board.
2. Connect LED cathode to resistor.
3. Connect resistor to GND of the arduino board.
4. Connect Button leg to digital pin 7 of the arduino board.
5. Connect Button other leg to GND of the arduino board.
*/

// Define variables
const int buttonPin = 7; // Digital pin for the push button
const int ledPin = 9;    // Digital pin for the LED
int buttonState = LOW;   // Current state of the button
int lastButtonState = LOW; // Previous state of the button
unsigned long lastDebounceTime = 0; // Last time the button was toggled
unsigned long debounceDelay = 50;   // Delay time for debounce

void setup() {
  pinMode(buttonPin, INPUT); // Use the internal pull-up resistor
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int reading = digitalRead(buttonPin);

  // Check if the button state has changed
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }

  // Check for button debounce
  if ((millis() - lastDebounceTime) > debounceDelay) {
    // Update the button state only if it has been stable
    if (reading != buttonState) {
      buttonState = reading;

      // Toggle the LED state when the button is pressed
      if (buttonState == LOW) {
        digitalWrite(ledPin, !digitalRead(ledPin));
      }
    }
  }

  lastButtonState = reading;
}