User talk:Mrnuke

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BM857 PC interface cable

I'm trying to build a PC interface cable for my Brymen BM857. I have used Radioshack 276-142 IR diode and photo-transistor set, and a PL2303 USB to serial converter.

If you have a real cable you'd like to donate, hop on to #sigrok and contact me.

Info

This is an experimental homebrew design. It does NOT work. It is yet unclear which of the following reasons, if any is the cause

  • Photo-transistor and/or diode do not support 9600 baud reliably
  • The BM857 uses a different wavelength
  • The value of the photo transistor pull-up resistor is too high or too low

TODO

Schematic

  • The IR diode and phototransistor are prominent on the board

  • Board being held in place by the rubber holster

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