Difference between revisions of "User talk:Mrnuke"
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* Photo-transistor and/or diode do not support 9600 baud reliably | * Photo-transistor and/or diode do not support 9600 baud reliably | ||
* The BM857 uses a different wavelength | * The BM857 uses a different wavelength | ||
* The value of the photo transistor pull-up resistor is too high or too low | * The value of the photo transistor pull-up resistor is too high (too sensitive) or too low (not sensitive enough) | ||
TODO | TODO | ||
Revision as of 22:10, 27 November 2012
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 (too sensitive) or too low (not sensitive enough)
TODO
Schematic
Photos
The IR diode and phototransistor are prominent on the board
Board being held in place by the rubber holster
