I opened the connector and wired GPIO21 and GPIO20 to P5 header pin 5 and 6. I measured the connections of the modified cable. They are good. But the RasPi doesn't recognize the input.
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Is it necessary to wire the P5 ground?
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Both of them(Pin 7 and 8)?
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What to do with P5 header pin 1-4?
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Is P5 header pin 1 really located at the bottom left oft unipi (power source connector up)?
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JP 2-5 are all switched to the labels for external power source. Are they connected then?
Thanks a lot!