Debounce

Parts

-Arduino microcontroller and carrier board

-LiPo battery

-Switch button

-Resistor

-3 Jumper wires

Prepare the breadboard

Program the Microcontroller

/**

 * @file: Debounce

 * @date: 4/5/2011

* @DESCRIPTION

 * Each time the input pin goes from LOW to HIGH (e.g. because of a push-button

 * press), the output pin is toggled from LOW to HIGH or HIGH to LOW.  There's

 * a minimum delay between toggles to debounce the circuit (i.e. to ignore noise).

 * http://www.arduino.cc/en/Tutorial/Debounce

**/

#define buttonPin 2

int buttonState = 0;             // the current reading from the input pin

int lastButtonState = LOW; // the previous reading from the input pin

long lastDebounceTime = 0; // the last time the output pin was toggled

const long debounceDelay = 50; // the debounce time; increase if the output flickers

//--- Function: Setup ()

void setup()

pinMode(buttonPin, INPUT);

//--- Function: Setup ()

void loop()

int reading = digitalRead(buttonPin); // read the state of the switch

  // If the switch changed, due to noise or pressing:

if (reading != lastButtonState)

lastDebounceTime = millis(); // reset the debouncing timer

if ((millis() - lastDebounceTime) > debounceDelay)

    buttonState = reading;         //    actual current state

// save the reading. Next time through the loop, it'll be the lastButtonState:

  lastButtonState = reading;

Code from Lecture

int reading = 0;

int buttonState = 0;

int lastButtonState = LOW;

int lastReading = LOW;

long lastDebounceTime = 0;

#define buttonPin 3

void setup()

    pinMode(buttonPin, INPUT);

    Serial.begin(9600); delay(25);

void loop()

    reading = digitalRead(buttonPin);

    if (reading != lastReading)

        lastDebounceTime = millis();

    if ((millis() - lastDebounceTime) > 50)

        buttonState = reading;

        if (buttonState&(!lastButtonState))

            Serial.println("button press");

}

        lastButtonState = buttonState;

        lastReading = reading;

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