Did you know that you can use Arduino to turn on an LED when you press a button? Well, it is true, you can do this! Leaving the joke aside, let me show how you can achieve this. You will need the ...

[Ed] was tasked with adding push-button degaussing to an arcade cabinet ... of transistor-based designs on paper, grabbed a nearby Arduino. [Ed] took off the PTC and soldered in two wires ...