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well that didn't fix the problem I was having, but it got me on the right track. The i2c library i'm using for the Rpi writes a value as it reads the arduino. I had thought that it had just strictly read or write the i2c bus. So I was writing and reading bad values all over the place. it's now fixed.

Ximidar
– Ximidar

2015-08-18 06:30:23 +00:00
Commented Aug 18, 2015 at 6:30
1

If that fixed the problem please accept the answer, so that Stack Exchange doesn't keep throwing it back as an unanswered question. Thanks!

Nick Gammon
– Nick Gammon ♦

2016-04-12 05:49:12 +00:00
Commented Apr 12, 2016 at 5:49

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