Day4 01-debounce

• debounce를 이용한 LED제어

const int ledPin = 3;

const int buttonPin = 2;

int ledState = LOW;

int buttonState = HIGH;

int lastButtonState = HIGH;

unsigned long lastDebounceTime = 0;

unsigned long debounceDelay = 50;

void setup() {

  // put your setup code here, to run once:

  pinMode(ledPin, OUTPUT);

  pinMode(buttonPin, INPUT_PULLUP);

  digitalWrite(ledPin, ledState);

}

void loop() {

  // put your main code here, to run repeatedly:

  int reading = digitalRead(buttonPin);

  if (reading != lastButtonState) {

    lastDebounceTime = millis();

  }

  if ((millis()-lastDebounceTime) > debounceDelay) {

    if (reading != buttonState) {

      buttonState = reading;

      if (buttonState == LOW) {

        ledState = !ledState;

      }

    }

  }

  digitalWrite(ledPin, ledState);

  lastButtonState = reading;

}