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- const int buttonPin = 12; // the number of the pushbutton pin
- const int ledPin = 13; // the number of the LED pin
- // Variables will change:
- boolean ledState = LOW; // 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;
- }
- if (buttonState =! lastButtonState) {
- ledState = !ledState;
- }
- // set the LED using the state of the button:
- digitalWrite(ledPin, ledState);
- // save the reading. Next time through the loop,
- // it'll be the lastButtonState:
- lastButtonState = reading;
- }
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