Would agree that the straight header doesn't appear to be soldered to the I2C board. Had this issue recently on an similar style board except that I had a couple of cold solder joints that needed to be refreshed. I used an ohm meter and put one lead on the straight pin that gets pushed into the protoboard and another lead on the PCB pad that the straight pin is in contact with. Check for resistance which should be zero if the solder joint checks out ok. Other than that, I would add in one I2C device at a time, make sure it works and then add in the next I2C device, etc.
Statistics: Posted by rgregg — Sat Feb 15, 2025 1:24 am