Subject:
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Re: LEGO motors and the handyboard ?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 20 Sep 1997 18:23:29 GMT
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Original-From:
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Jeffrey Strauss Morehead <MOREHEAD@ECE.UTEXAS.stopspamEDU>
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Viewed:
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1271 times
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Cutting the trace is only ONE solution! I had the same problem and did not
consult the handyboard FAQ on the web. This FAQ gives you some options if
you don't want to damage your board. Another solution is to use your own
custom H-bridge, or do like we did. This is also in the FAQ: get another
14 pin dip socket an bend the motor supply pin up, (I believ it is pin 7,
the same pin metioned below). Then put a separtate battery on that pin and
common ground the battery to the HB. Now the L293D gets motor current from
your battery and it is not destructive to your board.
jm
On Fri, 19 Sep 1997, Patrick P.K. Hui wrote:
> The HB gets reset due to the large current drawn from the motors. You
> should separate HB and motors power supply. What you need is to cut the
> trace (+ve motor power share with HB main power) nearby J13.
>
> Then, apply motors power supply to J13 and your motors will run smoothly
> without getting HB to reset.
>
> Patrick
>
>
> --00--------------------------------------------------------
> Low cost MIT Handyboard supplier and
> Official Distributor of Interactive-C 3.1
> WWW: http://home.hkstar.com/~huip for more info
> E-mail: huip@hkstar.com
>
> L.S.
> >
> > Recently I connected 3 standard LEGO motors to the Handyboard to power a • 4
> > wheel driven LEGO model I build. With the standard LEGO (9v 7VA) adapter • I
> > can easily run 3 motors at once without any noticable slow down of any of
>
> > them. But when connected to the Handyboard I can not power 2 motors or • more
> > at the same time because the board resets then. I first thought it was • the
> > gearing but after trying to run more motors at the same time without any
> > gears or load I found that when I run 2 motors and increase the speed • above
> > level 5 they are taking to much power and the board resets. When the • motors
> > have to carry the handyboard around a speed of 3 is the maximum ! Running
>
> > them whithout my adapter connected is almost impossible...
> >
> > Is this all a correct ? Or is there something else going on. ?
> > Please any help would be welcome,
> >
> > Jaron Paludanus,
> > j.paludanus@tip.nl
>
>
>
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Message is in Reply To:
 | | Re: LEGO motors and the handyboard ?
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| The HB gets reset due to the large current drawn from the motors. You should separate HB and motors power supply. What you need is to cut the trace (+ve motor power share with HB main power) nearby J13. Then, apply motors power supply to J13 and (...) (27 years ago, 19-Sep-97, to lugnet.robotics.handyboard)
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