I2C.scan missing value
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@ketchup-T That's indeed strange. You should expect [26, 80] as result. Are proper pull-up sensors in place? And does the sensor work on 3.3V?
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You have reason, the problem related to my sensor. I plug the cables GND and 3V3 to the ESP kit instead of Expansion board, and it works. I tried to connect another sensor to Expansion Board, and it also works! Now I can receive
[26,80]. Thanks you. Because the problem is not about software but hardware, so I will close this topic. Thanks for your help anyway
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