[bobricious] might have just cracked it. For his Hackaday Prize entry, he’s created a tiny USB keyboard out of tact switches. What’s the secret? An entire panel of PCBs. It looks great ...

The idea is simple, the nozzle pushes down on the PCB which has a tact switch underneath. When the switch closes, an LED lights. In practice, you measure the height of the board and use that for ...