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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@user50001
This is very cool. Did you consider doing something similar with a photo sensitive diode held up to an area of the screen? If that was built onto the pico it would require even less hardware and you would have your device independence. You would have to have a good "key" pattern to enable transfer.