[Tinyos-help] ADC

[Michael Schippling]

There is some indication that the mica ADCs (at least) will queue
getData() requests on different channels and fire them sequentially.
However I'm not a trusting sort, so I chain them by starting a new
conversion from the dataReady() of the previous.

The actual conversion time depends on the setting of the pre-scale
clock (again in micas, but I think tmotes have a similar feature).
IIRC the slowest mica2 conversion is about 1/3 milli-sec and the
fastest is on the order of 256x faster. Theres a table in T1
mica2/ADCControl.nc that shows something or other like this.

MS

Eric Keller wrote:
> What hardware are you using?  I suspect that it will not work as written, but
> if it does, the data will be returned in the order you call the get
> data.  I think you have to
> trace through the calls that you have made and see what is actually done when
> you make the calls.  It's a lot of work.
> Eric
> 
> 
> 
> On Mon, May 5, 2008 at 2:07 PM, subhash nemani <subhashnemani at gmail.com> wrote:
>> hi
>> In this code  i'm  calling  all of  the  sensors  connected  to  the  ADC
>> ports  simultaneously
>> what will be the time lag between the data acquisition from the ADC ports?
>> will i get all the samples simultaneously????????
>>  please give me reply as soon as possible.
>>
>>
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-- 
Platform: WinXP/Cygwin
TinyOS version: 1.x, Boomerang
Programmer: MIB510
Device(s): Mica2, MicaZ, Tmote
Sensor board: homebrew