• Thank you both, I understand the shortage sounds plausible, but I am very sure there is no connection between D0 and GND. After connecting battery (LFP having 3.24v) I disconnect the lower right red clamp. A zoomed image shows that the upper clamp only touches D0.
    Maybe the voltage is too high for D0?

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    • IMG_2828.jpg
    • IMG_2827.jpg

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