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Anything related to printer controllers not being Duet, RAMPS or Sanguinololu: microprocessors, motor and heater driver circuitry, gEDA/KiCAD issues, soldering tips, etc.
Re: How Can you Make a USB to TTL cable for Sanguino? - 15 years ago
worked for me as well. Cheap ca-42 cable ($1,80) from ebay. Pinouts are marked with numbers on the PCB that (seem to) match the prolific 2303 data sheet. "Seem to", because I could not get auto-reset working, even though RTS/DTR and so on should be available, but as I don't have a scope I cannot see what is going on. I used (sanguino) TXD ->R200-> RXD (2303) ->R220->GND to get TXDby icsmoke - Controllers