งานปฏิบัติที่17

int buttonPin = 4;
int ledPin =  13;
boolean buttonState = 0;
void setup() {

  pinMode (buttonPin,INPUT);
  pinMode (ledPin,OUTPUT);

}

void loop()
{  buttonState = digitalRead(buttonPin);

      if (buttonState == HIGH) {
         digitalWrite(ledPin, LOW);
      } else {
         digitalWrite(ledPin, HIGH);
      }

}