Thread: Controlling Arm travel - Limit Switch or Mechanical Stop?
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Unread 23-06-2002, 23:55
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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Re: Tweaking Pots
Posted by Chris Hibner at 2/2/2001 7:28 AM EST


Coach on team #308, Walled Lake Monster, from Walled Lake Schools and TRW Automotive Electronics.


In Reply to: Pots seconded
Posted by Andy Baker on 2/1/2001 7:11 AM EST:



You can easily tweak your pots at a small cost of a little resolution and one subtraction operation per pot. Set your pots so that they only use about 20-235 A/D counts from limit to limit in normal operation (20-235 is just an example, use your judgement). You can then put a button on your controller to sample each pot (you should actually take at least 5 samples and average them) and write that value to memory to serve as an offset. Therefore, you don't have to mechanically adjust the pots - just put the mechanisms in a reference position and push a button and they all sync up. It takes a little work in software but is well worth it if a pot drifts a little between rounds in the finals.

-Chris



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