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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Sat, 25 Aug 2001 22:34:50 GMT
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Original-From:
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frank_schaffer/fra/itelligence@svcIHATESPAM-ag.net
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Viewed:
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531 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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Message has 4 Replies:
 | | Re: Building a peripheral bus from motor output
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| (...) Do you have a link to this paper? We are taking a similar approach and using SPI on our JCX controller. We have designed in support for over 20 addressable I/O modules. For example, 4 motors are a module, 8 Lego compatible inputs takes up 2 (...) (23 years ago, 27-Aug-01, to lugnet.robotics)
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