Subject:
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motor port problem
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 16 Nov 1998 11:15:11 GMT
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Original-From:
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phillip chia <[philchia@]StopSpam[singnet.com.sg]>
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Viewed:
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1680 times
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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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| 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 (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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