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I could not see that so to identify the ground (GND) pin on the S21 5-pin connector, I assumed that the first and last pins are GND and 5V so I used a multimeter to measure the voltage between these two pins. By checking the polarity on the multimeter display, I was able to confirm which pin is ground — when the red probe was on 5V and the black on GND, the multimeter showed a positive voltage.

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@GeertvanHorrik
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@eMeF1
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Answer selected by tunnus-1
@tunnus-1
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@Tamsy
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@tunnus-1
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@joshwillcock
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@tunnus-1
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@joshwillcock
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