Subject:
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(no subject)
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 26 Jun 1996 21:33:03 GMT
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Original-From:
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System User <lylehaze@n-!NoSpam!jcenter.com>
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Reply-To:
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Lyle Hazelwood <LYLEHAZE@N-spamcakeJCENTER.COM>
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Viewed:
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2997 times
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My earlier posting has left me thinking.. (Suprise!)
A MUCH more efficient way of doing PWM would be to use another 'HC11. The
counter-timer circuits are perfect for the job, and the SPI would serve
just fine for communications. Of course, this would leave a great deal of
available processor time at the slave end.. Perhaps writing the low-level
navigation commands into this processor, allowing it to handle LOGO-like
commands from the main unit. This "Navigation processor" could take simple
instructions, and handle motor PWM, encoder processing, and synchronization
of the driven wheels independent of the main processor. There would be very
little circuitry needed, the base 'HC11 includes almost all the required IO,
Timers, counters, RAM and EEPROM to do the job.. only a voltage regulator,
Valid power detect, crystal, H-Bridge, and connectors for the SPI and
SCI would be needed.
Building it by hand poses a problem.. Where to get a breadboard that will
accept the high-density pins from a HC11?? (Or use another type of HC11!)
Perhaps It would best be built from a MiniBoard, or a HandyBoard with just
the needed parts installed??
Of course, the real challenge here is to write it ALL in assembly, so that
IC won't be needed in the slave (no need for the extra RAM, no conflicts
with timer usage). I have seen some nice PWM routines in the 'HC11 book.
I haven't looked for SPI code there..
All this is too much for me right now, My workload is overrun without this
additional project. But perhaps in the future, as these other things are
finished....
Any comments, suggestions, or assistance are invited.
8^) Lyle Hazelwood<lylehaze@n-jcenter.com>
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