A demanding and yet really, really cool project. There is something special about the retro sound of an old school typewriter and to see it being used as a modern input device is mind-blowing. — Douglas
I modified a vintage type writer to function as a USB keyboard using an Arduino and 50 phototransistors. The typewriter is a German Olympia Monica that I bought at a local flea market. For this project I created a simple PCB that carries the phototransistors and several multiplexers and decoders. The PCB is connected to the Arduino through a ribbon cable. I used an Arduino Leonardo, which can function as a USB input device.
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