Subject:
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Building a peripheral bus from motor output
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 24 Aug 2001 20:58:51 GMT
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Original-From:
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Mark Crosbie <mcrosbie@happy.xkey.&avoidspam&com>
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Viewed:
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566 times
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Hi all,
I recently read an excellent paper by Fred Martin (of MIT fame) on building
toys in a modular fashion. His microcontroller was similar to the RCX but had
one key addition - a two wire serial bus so that active peripherals could be
attached and controlled.
I want to use a motor output to be the signal line - the 7 different motors
power levels would correspond to different PWM waveforms, which would be
decoded by the active peripherals and interpreted as values. A simple protocol
would be used on the wire: (command,value) pairs are sent at (say) 2400 baud,
with only the RCX as a master and all others as slaves, and each peripheral is
assigned a unique "bus id" between 1 and 7.
Has anyone attempted this before? I'm thinking of hooking my scope up to the
motor output to see the output waveforms and then building something on a PIC
to time the waveforms to compute a value in the range 1-7.
Ideas? Comments? Am I off the wall?
Mark.
PS: LEGO, if you're listening, please build a bus attachment into the RCX for
infinite expandability :-)
--
Mark Crosbie mark@mastincrosbie.com
Linux, Electronics and LEGO all at http://www.mastincrosbie.com/mark
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