Subject:
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Re: Add motor driver to RCX
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 5 Aug 2004 16:43:58 GMT
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Viewed:
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4145 times
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In lugnet.robotics.rcx, Steve Hassenplug wrote:
> > John Barnes (HiTechnic) has available a motor amplifier which draws it's power
> > from an external source, and can control 4 motors from 1 RCX ouptut. I haven't
> > tried one, but you might find it helpful: http://www.hitechnic.com/Motoramp.htm
>
>
> 1) I'm not sure these are currently available
> 2) They only give you independent control of two motors per RCX output (but you
> can connect motors together)
> 3) They won't work with the 8366 motors (they were designed before those were
> available)
The amplifiers definitely won't work.
I am bringing a demo 'bot to BrickFest which uses the buggy motors with an RCX.
The RCX actually drives regular technic gear motors which drive a cam shaft
which operates the buttons on the 9v (6 x AA) battery box. So in a sense, the
gear motors, cams and battery box buttons are a mechanical amplifier. And by
golly, the resulting 'bot has some serious pep! The first time I tried it on the
kitchen floor (only non carpet floor in the house), it nearly killed the cat!
Took off at amazing speed and destroyed itself against the 'fridge. Since then,
I have geared the buggy motors down - not to get more torque, but - to slow it
down enough to where I can catch it!!!!
So while we all sit and ruminate on how to pass the elusive float state to an
external H bridge chip, you can always try what I did and risk life and limb in
the process ;)
JB
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Message has 1 Reply:
 | | Re: Add motor driver to RCX
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| (...) I've drawn a circuit to control more powerful motors (sadly in Visio format at the moment, though I my convert to jpeg later to post it). Since the H-bridges have flywheel diodes across the transistors, this will short the motor when the (...) (20 years ago, 5-Aug-04, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: Add motor driver to RCX
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| (...) 1) I'm not sure these are currently available 2) They only give you independent control of two motors per RCX output (but you can connect motors together) 3) They won't work with the 8366 motors (they were designed before those were available) (20 years ago, 5-Aug-04, to lugnet.robotics.rcx)
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