PSC with Continuous Rotation Servos

skatj

I'm building a GPS-navigated robot using two continuous rotation servos as the drive system. They are pretty straightforward, but I do have one issue. Since the PSC centers all servos on power-up, the two continuous rotation servos move very slowly. My program doesn't start running until the GPS has acquired 4 or more satellites, so obviously I don't want them to be moving, so my question is how do I stop this from happening?

I ran a search and found this:

zoot said...

If your continuous rotation servos have a screw-adjustable pot for "tuning" the neutral point, that would be easiest. If you can not adjust the neutral/center point on the servo itself, you will need the host that is controlling the PSC to send your calibrated "neutral" pulsewidths upon startup.

I bought my servos from Parallax so they do have this adjustable potentiometer, but this post only briefly touched this method. How exactly would I go about doing this?

Post Edited (skatj) : 2/4/2008 4:20:54 AM GMT

Franklin

You power up the psc and when it 'centers' the servos you CAREFULLY adjust the screw until they stop moving. This is a very critical adjustment and you may have to try several times to get it right. Also this adjustment will drift over time and may need to be done again in the future.

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- Stephen

skatj

Thanks Franklin, it worked just what I was looking for