[Tinyos-help] ADC DC offset Voltage...

Joe Polastre joe at polastre.com
Mon Sep 19 11:11:51 PDT 2005

What version of TinyOS are you using?  I don't know what release
Crossbow distributes with their motes, but I would recommend upgrading
to 1.1.13 (don't use 1.1.14, it has a bunch of bugs)

-Joe Polastre
Moteiv Corporation

On 9/19/05, Mike Deneen <mpdeneen at gmail.com> wrote:
> Hello all,
>  I'm just getting started with the Crossbow Telos B motes and I'm trying to
> read the voltage off of a microphone.  Since the signal will swing positive
> and negative and I'd like to get as much of the 0-3V input swing as
> possible, my amplifier's output has a 1.5V dc offset.  When I connect the
> amp output to the ADC pin, the voltage drops to about 10 mV.  When I
> disconnect the ADC pin the voltage goes back to 1.5V.  The pin is ADC0, if
> that matters at all.
>  I've searched the archives and there seem to be plenty of people who are
> doing what I want to do, so I must be doing something wrong.  
>  Little help?
>  Thanks,
>  -Mike
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