Digital input: what is it again? Let’s say that you’re standing outside a friend’s house looking through the window at a light switch. Your friend calls to ask “Is the light switch on?” Your job is to tell the friend “yes the light switch is on” or “no, the light switch is off.” That’s exactly […]

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Adding a second button We are going to add another button to our circuit so we can play a 2 note tune on our mini-keyboard instrument. We will need another button, another 10 K ohm resistor and more jumpers. Remember to unplug your Arduino from your computer before you add to the circuit. Parts to […]

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