Subject:
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Re: motor port problem .
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 19 Nov 1998 02:21:19 GMT
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Original-From:
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phillip chia <philchia@singnet.NOMORESPAMcom.sg>
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Viewed:
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3731 times
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hi ,
Attached from the previous mail, I have already solved the problem listed
below. It is the 7404 is damaged .What causes it? Any ideas?
RIght now this problem that melted my socket on the L293, the supply I used
is 12V supply to my 2 DC motors. I'm using Grandcell rechargable alkaline
batteries. Each is 1.5v.
The measure current is about 700mA.
rgds,
phillip
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> From: FThompson9@aol.com
> To: handyboard@media.mit.edu
> Subject: Re: motor port problem .
> Date: Tuesday, November 17, 1998 10:00 PM
>
> Philip
> I would first suspect that the motor chip has blown. This is eash • to
> check since the Handy board has two L293 chips. Swap them (disconnect • your
> motor connections) and run testmotors(). If the problem follows the • chips,
> replace the bad one. (You might want to buy a small stock of extra L293
> chips.) If the problem does not follow the chips, I would suspect the • 68HC11
> chip. You will probably need an osciloscope to be sure, but start at the
> inputs to the L293 and trace back to the chip to be sure of the signal • your
> getting. (There is a 74374 and 7404 that you will need to check. You • will
> find all this documented in the Handy Board Technical Reference manual. • See
> page 49 for details on the motor drive.
>
> Pherd
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