3. GPIO Programming

Question.3

Kevin has built the following circuit. When will the LED turn ON?

void setup() {
  pinMode(4, OUTPUT);
  pinMode(2, INPUT_PULLUP);
}

void loop() {
  int buttonState = digitalRead(2);
  if (buttonState == HIGH) {
    digitalWrite(4, HIGH);
  } else {
    digitalWrite(4, LOW);
  }
}

The LED will glow only when the button is pressed.
The LED will not glow at all irrespective of a button press.
The LED will stay ON contentiously irrespective of a button press.
The LED will glow when the button is not pressed.

Restart quiz!