On Tue, 12 Jun 2018 17:31:07 -0400, Dennis Lee Bieber wrote:

> On Tue, 12 Jun 2018 21:23:25 +0100, mm0fmf  declaimed
> the following:
>
>
>>When my meter leads are unconnected the meter registers 0V. Does that
>>imply both leads are also at 5V?
>
>  No... Only that both are at the same potential... And unless the
RPi is
> seriously damaged, one can probably assume that the 5V pin IS at 5V, so
> a 0V differential means the GPIO is also at 5V.

... or is disconnected or has a pull-down resistor to ground.

In view of the uncertainty on what is happening, I suggest the OP posts
two voltage readings:
- between ground and the 5v pin
- between ground and the GPIO pin he's monitoring


--
Martin    | martin at
Gregorie  | gregorie dot org

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