Difference between revisions of "User talk:Mrnuke"
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== BM857 PC interface cable == | == BM857 PC interface cable == | ||
I'm trying to build a PC interface cable for my Brymen BM857. I have used [http://www.radioshack.com/product/index.jsp?productId=2049723| 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 === | === 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 | TODO | ||
==== Schematic ==== | ==== Schematic ==== | ||
Revision as of 00:06, 24 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 or too low
TODO
Schematic
The IR diode and phototransistor are prominent on the board
Board being held in place by the rubber holster
