Re: [CAD_CAM_EDM_DRO] Re: steppers best?

In a message dated 10/17/2007 5:03:45 A.M. Mountain Daylight Time,
chuckm@... writes:




Thanks guys - I'm sooo thankful for the internet and either other time
zones, OR insomniacs, whichever allows me to leave a ? at 11:34PM pick up
some suggestions by 05:00 the next AM :o))

You raise good questions, that I didn't cover in the initial request for
info.

Time - is actual time vs predicted time, so accuracy is more important than
speed, IF the trip is made in less than 45 seconds (for 5 - 10 M), which
seems easy w/o ramp up.dn..

Electronics and $ - I need to check on the both of these, but I should think
that $50 wouldn't be outside the rules, and my reading of the rules does not
outlaw electronic timers or line followers (there's an "on target" component
to the scoring) and in the past, they've specifically outlawed such devices
(in an event called "Wheeled Vehicle" vs this year's event called "Electric
Vehicle"), so I think they were trying to open this event to novice
electronics kids (and mentors :o)) ).

RE LCD - Well, I was thinking we might get away with just a pulser and
translator based on 555 and 5804's and L297/8N drivers, but that number of
steps display might be TOO COOL to pass up! We have some LCDs and 7 segment
LEDs in our "salvage" box, but might be a bit of a challenge to figure out
in parallel with the actual "let's drive a certain distance" problem. Hmm -
thanks for this and other suggestions!

So looks like we are on right path, if I understand feedback correctly.





*
*
Any chance the route will be curved, or that the Robot might not go
straight? If so, you might need some kind of corrective feedback??????? Trailing
back wheels with input to the controller????
bill



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