Author Topic: [SOLVED] I2C problem, only with Dev-board, when directly connected it works.  (Read 245 times)


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« on: October 03, 2017, 03:25:27 am »
Everything seems to work.
The cause was just cables I crimped myself where 3 out of 3 badly connected on 1 side. I never had problems with my crimping tool, so I really trusted the cables. The fact that I had some signal although with lots of noise made me think it was only pull-ups missing. After studying the scheme and measuring the pins I found out the connection was direct, so it had to be the cable.
The only thing I can think about why I measured a signal is because high frequencies travel through air. I saw the pulses and the I2C Nack reply, therefore I was completely stunned to find out it was just the cable.
I had the cable crimped at a bad night being little sick. So there was to much of the insulator crimped and it didn't touched the wire.
Glad I finally found it. ;D ;D ;D
Lessons learned:
1. I will never trust my cables again and always test them first.
2. Signals travel through air, this can be very misleading. If I only had a good grounding connection I would see it immediately but none of 3 cables had really contact, so Murphy in his fullest glory.

« Last Edit: October 03, 2017, 03:27:28 am by rudydevolder »
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