In principle this is done with just some resistor ladders but building a board to do this is a bit fiddly so I've just picked up one from Bitluni on Tindie.
I don't have an immediate use for this but the vague plan is to use it as some kind of display interface that speaks to my mesh network kit. Connect a PS/2 keyboard and you've got a terminal device based on a microcontroller, rather than using a Raspberry Pi as a bit of middleware and this appeals to me greatly.
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