Make: Robotic Arms

21Chapter 1: The Foundation of Robotic Arms

STEP 2

int btn;

void setup() {

Serial.begin(9600);

pinMode(2, INPUT_PULLUP);

}

void loop() {

btn = digitalRead(2);

Serial.println(btn);

delay(100);

}

STEP 3

We will compile and upload our code just as we did before. Once the code

has been uploaded, open the Serial Monitor. While the push-button is not

being pressed, you should see the number 1 printing over and over again.

When the push-button is pressed, that number should change to a 0. 1s and

0s—sound familiar? It’s binary! Remember, 1 is the same as on or high, and

0 is the same as off or low. Now that we know our push-button works, let’s

take things one step ...