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- /*
- Debounce toggle
- This code is in the public domain.
- Original code at http://www.arduino.cc/en/Tutorial/Debounce
- */
- const int buttonPin = 2; // the number of the pushbutton pin
- const int ledPin = 13; // the number of the LED pin
- int ledState = HIGH; // the current state of the output pin
- int buttonState; // the current reading from the input pin
- int lastButtonState = HIGH; // the previous reading from the input pin
- int isOn = 0; // the current state of the LED
- long lastDebounceTime = 0; // the last time the output pin was toggled
- long debounceDelay = 30; // the debounce time; increase if the output flickers
- void setup() {
- pinMode(buttonPin, INPUT_PULLUP);
- pinMode(ledPin, OUTPUT);
- }
- void loop() {
- // read the state of the switch into a local variable:
- int reading = digitalRead(buttonPin);
- // check to see if you just pressed the button
- // (i.e. the input went from LOW to HIGH), and you've waited
- // long enough since the last press to ignore any noise:
- // If the switch changed, due to noise or pressing:
- if (reading != lastButtonState) {
- // reset the debouncing timer
- lastDebounceTime = millis();
- }
- if ((millis() - lastDebounceTime) > debounceDelay) {
- // whatever the reading is at, it's been there for longer
- // than the debounce delay, so let's do our button action
- if(reading == LOW && isOn == 0) { // Is the button in a pushed state and LED is off?
- do
- {
- digitalWrite(ledPin, HIGH); // Turn it on
- isOn = 1; // and set the variable for the next go around
- } while(digitalRead(buttonPin) == LOW); // Don't stop until we actually let go of the button
- }
- else if(reading == LOW && isOn == 1) { // Is the button in a pushed state and LED is on?
- do
- {
- digitalWrite(ledPin, LOW); // Turn it off
- isOn = 0; // set variable to off
- } while(digitalRead(buttonPin) == LOW); // Don't stop until button is let go of
- }
- }
- // save the reading. Next time through the loop,
- // it'll be the lastButtonState:
- lastButtonState = reading;
- }
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