It's sure that's the problem. But is enough 20uS.
Vasile

On Tue, 3 Apr 2001, Dwayne Reid wrote:

> At 01:47 AM 4/3/01 -0400, Brian Reed wrote:
> >I've been using one A/D input for months and have now expanded
> >to 3.  I must really have something goofy in my code, because the
> >channels interact with each other.  Normally I'd do more testing
> >before asking here, but I'm going to try and run it at the SME robot
> >competion this Saturday (near Pittsburgh), so I wanted to ask if my
> >error is obvious...
>
> It sure looks as if you are not allowing adequate sample time.  You have to
> select the desired input channel, then wait for a short while (30 uS or so)
> before starting the a/d conversion.  The sample time allows the charge at
> the input to be stored on the a/d convertors's sample and hold
> capacitor.  The minimum amount of time required is specified in the data
> sheet but 30 uS should be lots.
>
> Give it a try and see what happens.
>
> dwayne
>
>
>
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
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