[Tinyos-help] Accelerometers+ATMega128L (Mica2Dot)

[Edgar Charry]

Hello guys, 
 
Has anyone any experience with accelerometers and the microcontroller ATMega128L (Mica2 and Mica2Dot)? I've just hooked up an Analog Devices ADXL330 acc with the dot one (using single-ended mode) but the noise that I've been seeing, even in static testings (tilting), just disrupt my whole measurement.
Although the resolution of 10 bits out of 3,3V (VReg) should give me resolution of around 3mV/bit, I have also taken analog measurements, but my digital values are just not keeping the same pace ((=Vout/Vref)*2^10). Sampling frequency is at around 33Hz (using prescaler freq of 450k). Output HW low pass filtering is set to a cut off freq of 500Hz. 
 
By using diff mode should theoretically lessen the noise. But has anyone implemented digital filtering onboard before, that could give useful tips? 
Cheers,
Edgar 
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