On 13/06/2018 19:41, druck wrote:
> On 13/06/2018 14:16, R.Wieser wrote:
>>> measuring between a GIPO & 5v reads
>>> 0v, so they are both the same voltage.
>
> No!
>
>> And as the OP (correctly) stated, they are (thus) both at 5v.
>
> No!
>
>> And if his measurement is correct (and it is), and he reads 0v
>> difference,
>> than, as Mark has got the same result on his voltage meter, his leads
>> should
>> logically be at 5v too (even though they are not touching anything but
>> air).
>
> No!
>
> If you measure between 2 pins and get 0V it /could/ mean they are at the
> same potential, or it could mean there is *NO* connection between them.
> That's why you always measure from the common ground to the pin.
>
> Ground to 5V should give 5V
> Ground to GPIO set high should give 3.3V
> 5V to GPIO should give 0V because they aren't connected.
>
> ---druck

Ding! Ding! Ding! Ding! We have a winner!

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