diff --git a/build/shared/dist/examples/Digital/Debounce/Debounce.pde b/build/shared/dist/examples/Digital/Debounce/Debounce.pde new file mode 100644 index 000000000..568100ff6 --- /dev/null +++ b/build/shared/dist/examples/Digital/Debounce/Debounce.pde @@ -0,0 +1,74 @@ +/* + Debounce + + 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). + + The circuit: + * LED attached from pin 13 to ground + * pushbutton attached from pin 2 to +5V + * 10K resistor attached from pin 2 to ground + + * Note: On most Arduino boards, there is already an LED on the board + connected to pin 13, so you don't need any extra components for this example. + + + created 21 November 2006 + by David A. Mellis + modified 3 Jul 2009 + by Limor Fried + + + http://www.arduino.cc/en/Tutorial/Debounce + */ + +// constants won't change. They're used here to +// set pin numbers: +const int buttonPin = 2; // the number of the pushbutton pin +const int ledPin = 13; // the number of the LED pin + +// Variables will change: +int ledState = HIGH; // the current state of the output pin +int buttonState; // the current reading from the input pin +int lastButtonState = LOW; // the previous reading from the input pin + +// the following variables are long's because the time, measured in miliseconds, +// will quickly become a bigger number than can be stored in an int. +long lastDebounceTime = 0; // the last time the output pin was toggled +long debounceDelay = 50; // the debounce time; increase if the output flickers + +void setup() { + pinMode(buttonPin, INPUT); + 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 take it as the actual current state: + buttonState = reading; + } + + // set the LED using the state of the button: + digitalWrite(ledPin, buttonState); + + // save the reading. Next time through the loop, + // it'll be the lastButtonState: + lastButtonState = reading; +} +