Subject:
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interfacing PCs with LEGO?
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 22 Aug 2004 09:08:50 GMT
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Original-From:
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PeterBalch <PETERBALCH@COMPUSERVEihatespam.COM>
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Viewed:
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1203 times
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Joe
I do a lot of "mechtronics" and my philosophy is:
Use the PC for doing things that a PC is good at - like the vision and
intelligent planning.
Use a whole lot of PICs for doing what PICs are good at.
Any PIC con only do one time-critcal thing. OK, I know that in theory you
con multiplex all sort of control loops but, in practice, I've given up
doing that. If you have two time-critical things to do then use two PICs.
If you have three time-critical things to do ...
A cheap PIC costs around a dollar. So use one PIC per joint or motor to do
a PID-feedback loop or whatever.
Talk to all the PICs over a single serial line. Give each PIC an address
and only program it so it only responds to messages directed to it. All
PICs reply on the same "open-collector" serial line. Each only replies when
queried.
PICs can implement USB, CAN-bus, ethernet, etc. but for what you're
planning I would have thought RS232 (running at 0V..5V) would do everything
required.
Peter
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