Hi Shinichi Inoue, I was able to test my setup quickly using the pull-up/pulldown resistors, and everything worked well. I am not able to take data for 30 minutes at this time, but there is no reason why the device would work for 30 minutes, then provide bad data briefly, then work fine again. This seems like an external event is causing this problem Are you able to answer the two questions I asked in my last reply? -Bryan
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