Re: [Gumstix-users] Why A/D channel #7 has 1.4V input while others #2 to #6 has only about 0.11V?

[Gerardo R. <ge...@di...>]

just a stupid idea, since I still have 0 experience with Gumstix, though
mine is waiting in the office.

are you connecting the inputs to something? if not, then you may be
getting any value and it could be correct.

Try connecting input to gnd, if the pins are pig, it's safe to connect
one end of a resistor (mostly any not so low R value is fine) to gnd and
then touch the ADCIN2-7 with the other end of the resistor, and see how
the values change. If you do get changes (like all moving to 0 when you
touch them) then all is fine.

A cable instead of a resistor should be safe too. however, if any of the
pins is internally connected to something you may break something.
Though, if they are labeled as analog inputs they shouldn't be connected
to anything...

    gera

PS: of course that you may know all this, but just in case...

On 06/21/11 01:39, AKS wrote:
> Hi
>
> I have been testing on-chip ADC channels on Tide platform using Hugo Vincent's
> ADC test program. I wonder why A/D channel #7 has 1.4V input while others #2
> to #6 has only about 0.11V? Is that abnormal? Can anyone kindly explain this?
> Thanks!
>
> Sincerely
>
> Aung
>
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