Make: Robotic Arms

20 Make: Robotic Arms

on pin 2, the push-button would be useless, as it

would always be connected, and pushing the push-

button wouldn’t change the circuit. This is why we

typically connect the input wire of the push-button to

pins 1 or 2 and the output wires to pins 3 or 4.

Let’s look at our next circuit and build it on a

breadboard!

STEP 1

This circuit is very simple (Figure

1-29

). All we’ve

done is connect the input of the push-button to

digital pin 2 on our Arduino and connect the output

of our push-button to the ground pin on our Arduino,

making a very basic, but complete, circuit. Let’s write

some code and get our push-button working.

1-29