In message ,
Dave Liquorice  writes
>On Wed, 7 Aug 2019 22:10:45 +0100, Adrian wrote:
>
>> With the PI powered off, I put a meter on the connections this morning,
>> and the resistance across the two pins was off the scale, I was starting
>> to suspect a short circuit as it seemed to think that the "switch" was
>> always closed.
>
>I have a feeling that electronic hardware is not your forte.  B-)
>

You might think that, ...

>Which two pins? Presumably the GPIO and either +3.3 V or GND. A
>resistance measure "off the scale" to me means a very high
>resistance, open circuit, not short circuit.
>

Exactly.  The software appears to be detecting a closed switch (which a
short circuit would look like), whereas I appear to be seeing an open
circuit.

Not sure which pair of pins, I was looking at the two pins that the
gauge plugs onto.   Looking at the schematic, it appears to be pin 6 and
end pin on the inside track at the USB/ethernet end.

Adrian
--
To Reply :
replace "bulleid" with "adrian" - all mail to bulleid is rejected
Sorry for the rigmarole, If I want spam, I'll go to the shops
Every time someone says "I don't believe in trolls", another one dies.

--- SoupGate-Win32 v1.05