[Tinyos-help] ADC DC offset Voltage...
schip at santafe.edu
Fri Sep 23 13:49:25 PDT 2005
Not sure if this is any help, but on mica2/z
ADC0 is already assigned to the RSSI. I haven't
looked at the telosB schematic... Also it
may be defaulted to output in which case it
could sink a fair amount of current.
Joe Polastre wrote:
> 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:
>> 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?
>>Tinyos-help mailing list
>>Tinyos-help at Millennium.Berkeley.EDU
> Tinyos-help mailing list
> Tinyos-help at Millennium.Berkeley.EDU
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