Thread: Initial Power Spike
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Unread 24-06-2002, 00:42
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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Re: Initial Power Spike
Posted by Joe Ross at 2/11/2001 11:36 PM EST


Engineer on team #330, Beach Bot, from Hope Chapel Academy and NASA/JPL , J&F Machine, and Raytheon.


In Reply to: Initial Power Spike
Posted by Gautham Arumilli on 2/11/2001 11:04 PM EST:



: Hey everybody...We've been having this really weird problem when our robot starts up the past few days...Some sort of power spike on the PWM signal causes the drill motors to automatically move for a couple of seconds and then stop when the robot is started up, and we have no idea why...We've been wondering if anybody else has had this problem, and if it's a hardware problem or some sort of software problem on our part (we seem to have exhausted all possible causes, though)...Any help is appreciated.

One thing that our team has noticed is that the first packet of data from the radio modem is often all 0's. Since 0 is full reverse then it causes the motors to move (most often the drill motors). This doesn't always seem to happen but it happens enough that we compensated for it in software.

We wrote a few lines of code that checked for several of the values coming in being 0. If they are zero then we initialize everything to neutral.

I can't really explain why it happens (and why it only happens sometimes for us), but this fixes it for us.


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