On 07/10/2012 05:57 PM, Peter C. Wallace wrote:
If someone wants to write/debug such things, but lacks the expensive encoders (or the throw away money to buy them), I have a low-res solution to the problem.If there is demand, it is probably not a difficult one to write. >Like a number of other components, the problem is having hardware to >test with, or someone to do the testing vicariously.Pretty sure the SSI interface works, but the BISS one requires quite expensive encoders to test (Renishaw Resolute for example though some IC Haus demo boards might do)
I have a spreadsheet (.ods) that demonstrates a way to make reflected binary grey code (or at least I think that's what it's called.) The spreadsheet generates binary, then uses that to generate the grey code. Those are done up as numbers. next to them the conditional formatting to make a cell with a 1 in it to be black letters on black background, and a cell with a 0 in it be white letters on white background. Using the right dropping resistor the optics from an old mouse should be able to transmissively detect a 1 or a 0. I have included grey code for 2 bits on up to 6 bits, but it should be easy to expand for even more bits if you desire to. You could print out a page at a time, then insert rows at the top so that the next page has some redundancy for lining up and taping together. I you do make a linear encoder, it would be cool to see pictures and a write up on the WIKI.
ZZ-GRAY-CODE-STRIPS.ods
Description: application/vnd.oasis.opendocument.spreadsheet
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