按鈕燈泡

void setup() {

  //start serial connection

  Serial.begin(9600);

  //configure pin2 as an input and enable the internal pull-up resistor

  pinMode(2, INPUT_PULLUP);

  pinMode(13, OUTPUT);

}

void loop() {

  //read the pushbutton value into a variable

  int sensorVal = digitalRead(2);

  //print out the value of the pushbutton

  Serial.println(sensorVal);

  // Keep in mind the pullup means the pushbutton's

  // logic is inverted. It goes HIGH when it's open,

  // and LOW when it's pressed. Turn on pin 13 when the

  // button's pressed, and off when it's not:

  if (sensorVal == HIGH) {

    digitalWrite(13, LOW);

  } else {

    digitalWrite(13, HIGH);

  }

}

還沒按的時候

按下去的時候