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Originally Posted by Jeff Waegelin
So I'll pose another question: does anyone know where I could get acceptable encoders for less than $45-50? I have a limited budget, so I'd rather not have to spend that much if I don't have to.
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Jeff, my limited experience with encoders is with the Grayhill 63R series, which would work great, but are a little above your price range.
HOWEVER, we did use the hall effect gear tooth counters that came in the 2005 kit with varying amounts of success. They are definitely affordable, however to determine direction, all we did was check what our PWM output was for the appropriate motor.
We actually didn't count gear teeth, but sprocket teeth. The sensors seem to be resilient enough to pick up just about any ferrous material that comes close enough to it.
It's not an encoder, but it might be an affordable option.