Dear all,
I am using MTS310 board to collect data from all the sensors on the board. I am
suing tinyos-1.1.11. I have following problems with the microphone and accel
readings.
1) When I sample the microphone once every second, the output that I get is
different from that when the microphone is sampled 10 times in a second. The
difference is quite large. It is about 190 when I am sampling at once a second
and about 485 when sampling at 10 times per second. To calibrate the readings
from the sensors, I am using xlisten's formulae. Can someone guide me what is
the problem and at what rate should we sample? I dont need to reprodce the
sound- so I guess I dont need to sample at Nyquist rate.
2) Both the accelX and accelY readings are negative. Again, I am using the
formula in xlisten application. Please let me know how fast should I sample the
accelorometer and how should I interpret the values? I read in ADXL202E's
datasheet that the unit is g and it should be 0 g when there is not
acceleration. Also, even if if move the MTS310 board, both accelX and accelY
remain unchanged (same negative values).
Thank you,
Monica
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