DE bouncing is removing unwanted input noise from buttons, switches or other user input
Example Code
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 = LOW; // the previous reading from the input pin
unsigned long lastDebounceTime = 0; // the last time the output pin was toggled
unsigned long debounceDelay = 50; // the debounce time
void setup() {
pinMode(buttonPin, INPUT);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, ledState); // set initial LED state
}
void loop() {
int reading = digitalRead(buttonPin); // read the state
if (reading != lastButtonState) { // switch changed
lastDebounceTime = millis(); // reset the debouncing timer
}
if ((millis() - lastDebounceTime) > debounceDelay) {
if (reading != buttonState) { // if the button state has changed
buttonState = reading;
if (buttonState == HIGH) {
ledState = !ledState;
}
}
}
digitalWrite(ledPin, ledState); // set the LED
lastButtonState = reading; // save the reading
}
