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Unread 12-02-2012, 01:18
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wireties wireties is offline
Principal Engineer
AKA: Keith Buchanan
FRC #1296 (Full Metal Jackets)
Team Role: Mentor
 
Join Date: Jan 2006
Rookie Year: 2004
Location: Rockwall, TX
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ADXL345 - too noisy

FIRST Team 1296 is trying to get good data from a ADXL345 connected via I2C. We wrote some 50Hz sample data to a file and the device is working but sure seems noisy and the zero G offsets drifts (more than I would expect). I looking for helpful advice from some CDers that have had success with these sensors.

1 - Did you hard mount them? Or attempt to use some sort of vibration mount?
2 - Did you put bypass caps and/or power caps on the connectors?
3 - How much data did you average to get the zero G offset?
4 - How often did you reset the velocity and/or distance accumulators?
5 - Did you low pass the data? If so, what were the filter parameters?
6 - How reliable were you able to get them?
7 - Anyone tried using the FIFO or offset registers?

TIA


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