Subject:
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motor power problems
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 25 Jul 1998 00:43:29 GMT
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Original-From:
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Raphael Carter <anagram@chaparraltreeSTOPSPAMMERS.com>
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Viewed:
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1038 times
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Hi, everyone. I recently bought a preassembled handyboard from the Robot
Store in Hong Kong, and I'm having trouble with motor power. My robot
frame has two motors that can run at 3-4.5V. I was planning to use 5AA
Nicads as a power supply for the whole board (as suggested in the list
archives), which should give about 5V or so to the motors. I'd planned on
using PWM to run the motors at 3.5V or so for a good cruising speed.
Here's what I found:
- Any PWM setting high enough to run the motors at full speed was also
enough to light the "battery" light and reset the Handy Board. I can run
the motors at an unsatisfactory crawl -- about 2.25 V, according to my
voltmeter -- but anything higher makes the board reset. This problem
occurs even if I switch to an 8AA power supply.
- Even though my program waits for the start button to be pressed before
doing anything, sometimes the Handy Board starts up with both motors
running, apparently at full power with no PWM. Since this leaves the CPU
without enough power to run, the robot gets stuck in a full-speed-ahead
state. This heats up the L293Ds and is probably terrible for the motors,
especially when I'm trying to run the board off 8AA batteries. The robot
is also liable to jump off my desk while I'm trying to program it.
Has anyone had similar problems, and if so how did you solve them? I know
there's a way to provide a separate power supply for the motors, but I'd
rather not cut traces on the board except as a last resort.
If I do have to use separate power supplies, would the Handy Board itself
run OK with a 9V battery? At least that way I wouldn't have two bulky
power packs to deal with.
--
Raphael Carter <anagram@chaparraltree.com>
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Message has 1 Reply:
 | | Re: motor power problems
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| in short, the answer is: "you can't use 3 to 4v motors with the Handy Board." basically, these motors are cheap toy motors that are incredibly noisy from an electrical standpoint, plus they want to draw far more current than the Handy Board's motor (...) (26 years ago, 25-Jul-98, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | What about Fischertechnik?
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| I assume the Handy Board (HB) can be used with Fischertechnik products and parts. Is this correct? I just ran across Fischertechnik and was wondering if you all have any comments (preferably based on experience) about how this line of products (...) (26 years ago, 22-Jul-98, to lugnet.robotics.handyboard)
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