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- /*
- 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
- - 10 kilohm resistor attached from pin 3 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 Nov 2006
- by David A. Mellis
- modified 30 Aug 2011
- by Limor Fried
- modified 28 Dec 2012
- by Mike Walters
- modified 30 Aug 2016
- by Arturo Guadalupi
- This example code is in the public domain.
- http://www.arduino.cc/en/Tutorial/Debounce
- */
- // constants won't change. They're used here to set pin numbers:
- const int buttonPin = 3; // the number of the pushbutton pin
- const int ledPin = 13; // the number of the LED pin
- const int relayPin = 4;
- // Variables will change:
- int ledState = LOW; // 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
- // the following variables are unsigned longs because the time, measured in
- // milliseconds, will quickly become a bigger number than can be stored in an int.
- unsigned long lastDebounceTime = 0; // the last time the output pin was toggled
- unsigned long debounceDelay = 50; // the debounce time; increase if the output flickers
- void setup() {
- pinMode(buttonPin, INPUT);
- pinMode(ledPin, OUTPUT);
- pinMode(relayPin, OUTPUT);
- // set initial LED state
- digitalWrite(ledPin, ledState);
- digitalWrite(relayPin, ledState);
- }
- 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:
- // if the button state has changed:
- if (reading != buttonState) {
- buttonState = reading;
- // only toggle the LED if the new button state is HIGH
- if (buttonState == LOW) {
- ledState = !ledState;
- }
- }
- }
- // set the LED:
- digitalWrite(ledPin, ledState);
- digitalWrite(relayPin, ledState);
- // save the reading. Next time through the loop, it'll be the lastButtonState:
- lastButtonState = reading;
- }
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