Noisy Accelerometer

[Russ Beavis]

This may be a bit of a stretch but when you're using graphs in LabVIEW, look out for autoscaling of axes. Is it possible that you're not really seeing noise but are instead observing a change in the acceleration axis' scale?

In LabVIEW, if you right-click on a graph's axis, you can change a number of parameters such as autoscaling and linear/log scaling.

Just a thought.

Has another else observed noisy accelerometer readings while driving motors?

Another test to run - put your robot on a stand so that it's not moving at all and observe the accelerometer readings with the motors off and motors running. Is there a difference even though the robot is on a stand? If so, you're probably coupling some motor current noise into your accelerometer reading (or into the power supply for the accelerometer).

Russ