Quote:
Originally Posted by mjcoss
We're seeing the same kind of jitter in the accelerometer from this years KoP. In all directions (x, y and z) we are getting odd values for an at rest bot. The nominal values are suppose to be 1.5V at rest. X is 1.84, Y is 1.76, Z is 1.74.
I tried resting the accelerometer on the ground, away from the bot and no change. I swapped the accelerometer with one from 2005, and while there's a little jitter it's in the +/- .002 range.
Now the new on is more sensitive (300 mV/G) and it's possible that we need to replace the bandwidth filter on the board, and isolate the board better but I'm leaning more toward that the board is broke.
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Your post is very informative, and a refreshing break from "It don't work". Thank You.
At rest, you shouldn't be able to see those values if everything is working - it corresponds to about 2.5g acceleration towards a corner. Something is wonky.
Do you have an oscilloscope? It could make debugging easier.
Can you plot the values over time? You may be able to see noise.
I would hold the accelerometer in each of the 6 basic positions (Z up, Z down, Y up, Y down, X up, X down) and record the values given. This may give you better insight into what is wrong.