/*
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;
}