Make: Wearable Electronics, 2nd Edition

140 Make: Wearable Electronics

// set pin as input

// use internal pull-up resistor

pinMode(buttonPin, INPUT_PULLUP);

}

void loop() {

// read input pin:

buttonValue = digitalRead(buttonPin);

// print button value:

Serial.println(buttonValue);

delay(100);

}

Upload the sketch to your Arduino board. Then, while the board is still

connected via USB, open the Serial Monitor, and you will see the switch

values change as you press and release the button.

When you press the button, the value should change to 0. Otherwise, it will

be 1.

See also Arduino’s “Digital Read Serial” page (docs.arduino.cc/built-in-

examples/basics/DigitalReadSerial).

You’ve now c