Day2 06_Debounce

• 디바운스를 이용해 버튼 누를때 생기는 노이즈의 영향을 받지않아 안정적이게 led 컨트롤 가능

const int buttonPin = 2;    

const int ledPin = 3;      

int ledState = LOW;        

int buttonState= HIGH;            

int lastButtonState = HIGH;  

unsigned long lastDebounceTime = 0;

unsigned long debounceDelay = 50;  

void setup() {

  pinMode(buttonPin, INPUT_PULLUP);

  pinMode(ledPin, OUTPUT);

  digitalWrite(ledPin, ledState);

}

void loop() {

  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;

}