Debounced Button rev_02

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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 */