[Tinyos-help] Sampling Rate and Accelerometer calibration for MTS400

[Edgar Charry]

Hi Rafael, 
I had the same challenge and the same infrastructure (Mica2-Rx/Mica2Dot-Tx and the MIB520, with the exception from the sensorboard - I got one ADXL330 acc). App freq? 100hz, that means Nyquist freq 200hz (sampling+transmission times).
 
I worked with the Telosb one in the past, but with this XBow ones never. I've downloaded the MoteWorks installation files and I am currently using single-hop app (if that's the case for you as well) called TestSensor for tx (Mica2Dot) and TOSBase (Mica2) for rx. You'll find'em in the installation files.
 
If you want to increase the tx frequency (or better definition: throughput (pckts/s)): have to go deep into the radio stack files => CC1000RadioM and CC1000ControlM. The first one carries out the implementation for tx (since preamble, sync bytes, payload, crc transmission and ack) and tx (either for TOSBase or TestSensor). Get rid of ack packets and RSSI measurements for collision avoidance (you have to go through this code) and packets will be sent pretty much faster. 
 
I don't know how much time do you have for this, but it's necessary to increase the throughput and also for your understanding as well.
Cheers,
Edgar Charry


Date: Fri, 9 May 2008 12:33:34 +0100From: raguilar at civil.uminho.ptTo: tinyos-help at millennium.berkeley.eduSubject: [Tinyos-help] Sampling Rate and Accelerometer calibration for MTS400


Dear All,




 
I have a Crossbow professional kit(mica2 platform with the mib520 board and MTS400 sensors). In this stage of my research actvity I am trying to vary the sampling rate of the board (I need sampling rates of 100Hz or so on for the accelerometers). Could anybody help me in finding the right apps for my sensors? . 
 
I am also trying to calibrate the accelerometers in order to obtain reasonable lectures and I don't know if there a specific apps to do this. 
 
Thank you very much for your answer and sorry for asking maybe so simple questions but because of my background (I am civil engineer) it is very difficult to me to get involved in the nesC language and also in the whole electronic concepts that this means.  
Rafael Aguilar

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