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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Fri, 20 Nov 1998 05:44:48 GMT
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Original-From:
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phillip chia <philchia@singnet.%stopspammers%com.sg>
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Viewed:
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3009 times
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hi Fred,
Why there is 2 holes each for the positive and negative supply on the pin
jack (J13)?
I thought that just insert one hole each for the positive and negative
supply only. I need to know why the J13 is designed for 1x4 holes before i
decide to cut the trace.
Is there any special requirement for power expansion for motor that i need
to use 4 holes instead of 2 holes ?
If I use 2 holes only( positive and negative) what will happen ?
I supply 12v rechargable alkaline batteries to 2 DC motor.
There is no explanation in the archive why the J13 is design with 4holes (
2 for positive & 2 for negative).pls help.
Thank. I need to hear from you asap.
rgds,
phillip
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> From: Fred G. Martin <fredm@media.mit.edu>
> To: phillip chia <philchia@singnet.com.sg>
> Cc: handybd <handyboard@media.mit.edu>
> Subject: Re: motor port problem
> Date: Tuesday, November 17, 1998 9:04 PM
>
> you may have blown one of your L293D chips.
>
> try swapping the two chips to see if the problem then migrates to
> motor 1. if it does, then you have blown an L293D.
>
> there is more info on debugging motor problems in the FAQ. See the
> answer to "One of the motor outputs has stopped working" at
>
>
http://el.www.media.mit.edu/projects/handy-board/faq/index.html#motordied
>
> Fred
>
> In your message you said:
> > hi,
> > i really need help urgently. Currently, I running my robot using 2 DC • motor
> > on port 2 & 3. I used external power supply to the L293D (pin 8). I did • not
> > cut the trace. I used Alkaline battery 12V recharagable . when I run my
> > robot, it is running smoothly. However, something went wrong. The port • 3
> > for the left motor is not rotate anymore.
> > I tried numerous debugging method to see what is the problem.
> >
> > Firstly, the outcome of the problem is that the port 3 red LED • (reverse) is
> > always turning on. When I used the command :
> >
> > a) motor (3,50); ==> red LED and green LED is light up
> > b )motor (3, -50); ==> red LED is light up. Green LED is not light up
> > the red LED is still turning on for both command . Not the green LED.
> > However, When I used command : off(3) ; the red LED on port 3 turned
> > off.
> >
> > I tried to load the "hbtest.c" and then type " testmotors( ); " The
> > result is that the motor LEDS is begin to flash one at a time , • beginning
> > with motor 0-green, motor 0-red, motor 1-green, etc. When it reach • port3
> > green LED, the port 3 red LED turn on all the way without turning off. • The
> > red LED stay light up even though the rest of the LED is still flashing
> > orderly. The port 3 green LED is still can flash normally. NO damage. • Only
> > the port 3 red LED has problem.
> >
> > Moreover, i pluck in the DC motor wires into the port 3, the motor is • not
> > moving. The rest of the port is moving .
> >
> > Please help .Thank .
> >
> > rgds,
> > phillip
> >
> >
> >
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Message has 1 Reply:
 | | Re: motor port problem
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| (...) to make the connector more physically and electrically stable. (...) of course, only 2 connections are needed to make a ckt. (...) you should figure up to several amps of current flow. (...) it should work fine. good luck. fred (...) (28 years ago, 21-Nov-98, to lugnet.robotics.handyboard)
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