Subject:
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Re: External Motor Power and the Expansion board.
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 24 Feb 1999 03:52:31 GMT
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Original-From:
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Fred G. Martin <fredm@media.STOPSPAMmit.edu>
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Viewed:
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811 times
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ahah, good question.
the exp bd grabs the 9v motor power for the servos, sonar, and 9v lego
sensors.
if you're not using any of these, you could leave connector off the
exp bd and you'll have no probs.
if these are important, you need to reconnect the severed trace on
your HB (reapplying the HB's 9v batt to that port), and then
separately apply your external power to pin 8 of the two motor driver
chips.
the easy way to do this is to remove the two chips, bend out pin 8
parallel to the chip bodies, insert back in sockets, and then run a
wire to the two pin 8's carrying in your external pwr.
external gnd can go to pin 4, 5, 12, or 13 of either chip (using the
same method).
fred
In your message you said:
> Greetings all!
> I just got the kit for the expansion board in the mail, and I
> realized something: I modified my handy board to accept external power
> for the motors through the power expansion header, using the
> instructions at:
> http://el.www.media.mit.edu/projects/handy-board/mods/hbmcut.html
>
> and now I don't know what to do because the expansion board uses
> that header for power, and I'd like to continue using an external
> battery to power my motors. Does anybody have any advice?
>
> --
> "Only two things are infinite,
> the universe and human stupidity,
> and I'm not sure about the former."
> --Albert Einstein
>
> Ryan "Rhino" Meuth
> http://i-tacoind.home.ml.org/
>
>
>
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Message is in Reply To:
 | | External Motor Power and the Expansion board.
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| Greetings all! I just got the kit for the expansion board in the mail, and I realized something: I modified my handy board to accept external power for the motors through the power expansion header, using the instructions at: (URL) and now I don't (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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