Caliper data port using ADC - no conversion circuit

EspDRO uses the ESPs ADC to avoid needing a level converter to receive caliper data. This makes me think I could do even better using STM32 ADC and Chibios: efficiently reading several calipers at once.

I got out the calipers I'd previously soldered wires too, and promptly managed to break the wires off one. There are several connectors on Thingiverse now. I think I better print one.

I found the EspDRO link in this one.

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