[Tinyos-help] 200Hz sampling rate using MDA300

[Marios Milis]

Hi,

 

I am using the MDA300 in order to acquire sensor data with a rate of 200Hz
(At this moment I have as input a sinewave).

In order to achieve this I have changed the XMDA300 Crossbow program in such
a way so as the mote to read 22 samples and then send them in one packet.

Also I have changed the following:

>From XMDA300M.nc: 

-          TIMER_RATE = 6ms

-          ANALOG_SAMPLING_TIME = 12

FROM SamplerM.nc component in the sensorboard/MDA300 directory:

   - TIME_SCALE = 10   (for resolution of ANALOG_SAMPLING_TIME equal to
0.01)

   - SCHEDULER_RESPONSE_TIME = 2

 

These are the minimum values with which the mote can work and get samples.
However I cannot get clear a signal of even 30Hz.

Does anyone know the exact meaning and functioning of the above parameters?

Can anyone propose a combination of these parameters that could result in
higher sampling rate?

In other case, did anyone achieve a sample rate of 200Hz using other way
(other driver than Sample)?

 

Any help would be appreciable.

Thanks a lot in advance

Marios

 

-----------------------------------------------------

Mr Marios Milis

Project Manager, SignalGeneriX Ltd

Maximos Court, Block B

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P.O.Box 51341

3504 Limassol

Cyprus

Telephone: +357 25870072

Fax:          +357 25870076

Email:  <mailto:marios.milis at signalgenerix.com>
marios.milis at signalgenerix.com

 <http://www.signalgenerix.com/> www.signalgenerix.com

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