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	- Project: Debounced Button
	- Source Code NOT compiled for: Arduino Uno
	- Source Code created on: 2025-10-06 21:29:38

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* give example of button. */
/****** END SYSTEM REQUIREMENTS *****/




/* START CODE */

/****** DEFINITION OF LIBRARIES *****/

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/*
  Button example on Arduino UNO:
  - Button connected between pin 2 and GND
  - Internal pull-up resistor enabled via INPUT_PULLUP
  - LED on built-in pin 13 toggles on each press
  - Debouncing implemented for reliable presses
*/

// Pin assignments
const int BUTTON_PIN = 2;
const int LED_PIN = 13;

// Debounce state
int lastButtonState = HIGH;
unsigned long lastDebounceTime = 0;
const unsigned long DEBOUNCE_DELAY = 50; // milliseconds

// LED state
int ledState = LOW;

void setup(void)
{
	// Initialize serial for debugging (optional)
	Serial.begin(9600);
	// Initialize pins
	pinMode(BUTTON_PIN, INPUT_PULLUP);
	pinMode(LED_PIN, OUTPUT);
	digitalWrite(LED_PIN, ledState);
	Serial.println("Button example started. Press the button to toggle LED.");
}

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

	// If button state changed, reset debounce timer
	if (reading != lastButtonState) {
		lastDebounceTime = millis();
	}

	// See if enough time has passed to debounce
	if ((millis() - lastDebounceTime) > DEBOUNCE_DELAY) {
		if (reading != lastButtonState) {
			lastButtonState = reading;
			// Button pressed (active LOW)
			if (reading == LOW) {
				ledState = !ledState;
				digitalWrite(LED_PIN, ledState ? HIGH : LOW);
				Serial.print("Button pressed. LED is now ");
				Serial.println(ledState ? "ON" : "OFF");
			}
		}
	}
}

/* END CODE */