Quote:
Originally posted by Burgabot
So, you'd recommend that I use last year's gyro for speeds less than 75 degrees/second, one of Future's for speeds greater than 75 and less than 300, and accelerometers for any thing greater than 300?
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Sorry for two posts in a row...
I would use last year's gyro for speeds less than 50 deg/sec, the 300 deg/sec gryo for less than 200 deg/sec. If you know absolutely, 100% FOR SURE what your worst-case speed is, you can reduce the margin (like use the 75 deg/sec gryo up to 65 deg/sec). Just be sure you account for getting bumped by other robots.
Also, I don't know if I would ever recommend using accelerometers. Our team actually thought of doing this last year (before we found the 300 deg/sec part), but we found a lot of potential problems. We decided that if we had to, we would be better off building an old-fashioned mechanical gyroscope and measuring the gymbal angle with a potentiometer.
If you do go with accelerometers, be sure you select the G-range appropriately. In other words, calculate out how much acceleration they will see in normal usage, then apply a little margin, then buy accelerometers in this range. Most accelerometers you'll find will be like +/- 50 G's. This will give you WAY too little resolution. You'll probably need a low-G accelerometer (like +/- 5 G), which you will pay an arm and a leg for.
-Chris