Hobby Motors
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What would I need to be able to make a hobby motor from Radio Shack where
the basic stamp can control its speed and direction? And roughly how much
would those cost?
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the basic stamp can control its speed and direction? And roughly how much
would those cost?
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> the basic stamp can control its speed and direction? And roughly how much
> would those cost?
Go to http://www.seattlerobotics.org/encoder/sep97/motors.html and look
towards the bottom for how to interface a motor with an L293D chip. It will
support up to a 36 V and 600 ma per side. You can get them at Mouser
Electronics on the net for $2.00 per chip. That is all the parts you need if
the ratings are suitable. If you need more current I have had good luck with
the L298N. They are $3.20 at Mouser and will handle 2 amps up to 36 volts
(Get good heatsinks to push them that hard). With this driver you will also
need 4 diodes and a few resistors. Figure $3.00 or so in additional parts.
As far as controlling the speed you would do that by sending a PWM signal to
the H-bridge. Problem is the Stamp will be completely tied up doing that and
will not be able to do anything else. You could use one of Al Williams PAK
controllers or the PWM PIC chip (very inexpensive solution) from Peter
Anderson ( http://www.phanderson.com/pwm.html )to handle the PWM and free up
the stamp.
Tim
[noparse][[/noparse]Denver, CO]
asked before. I am just learning how to work with bs2 and I am
wondering how to drive DC hobby motors. I need to run 4 to 5 motors
and I understand the bs2 won't run that many motors wihtout tying up
all the resourses. I would also like to vary the speeds of the motors.
If anyone can help me understand how to do this I would greatly
appreciate the help. Thanks for the understanding as I am new to this.
http://www.parallaxinc.com/html_files/products/BS_Accessories/s3_mmb_pwb.asp
http://www.parallaxinc.com/html_files/products/BS_Accessories/s3_mmc_mmc_car
rier.asp
The MMB can handle one motor and the MMC can handle two... you just program
the motor mind with the speed and the direction you want and it will do the
rest. Both use a serial interface, which make them extremely easy to
interface and use. If you just want simpler controller then the PAKV from
http://www.al-williams.com/pak5.htm would probably be something you'd want
to take a look at. If you want just simple on/off control then use a 74hc595
shift register (with appropriate power transistor) will do the trick. These
three items will cost you between 1 to 3 I/O pins, but takes the over head
of the Stamp having to manage the motors away. Hope this helps at least
some.
Chris Shuster
http://cpuman.cjb.net/
[url=irc://irc.serenia.net/tech]irc://irc.serenia.net/tech[/url]
Original Message
From: "David" <dwarren1@a...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, October 02, 2002 6:49 AM
Subject: [noparse][[/noparse]basicstamps] hobby motors
> Hi all, another newbie here and I have a question I am sure has been
> asked before. I am just learning how to work with bs2 and I am
> wondering how to drive DC hobby motors. I need to run 4 to 5 motors
> and I understand the bs2 won't run that many motors wihtout tying up
> all the resourses. I would also like to vary the speeds of the motors.
> If anyone can help me understand how to do this I would greatly
> appreciate the help. Thanks for the understanding as I am new to this.
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
controllers(depends on the power the motors demand) , they control 2
each and if you dont need to vary the direction you can have 1 wire per
motor or if you require direction change, 2 wires per motor(to do that
you might need the 40-pin bs2p if you need alot of other controls)
thats a lot of "ifs"
happy motor controlling,
THE TWELVE-YEAR-OLD
David wrote:
>Hi all, another newbie here and I have a question I am sure has been
>asked before. I am just learning how to work with bs2 and I am
>wondering how to drive DC hobby motors. I need to run 4 to 5 motors
>and I understand the bs2 won't run that many motors wihtout tying up
>all the resourses. I would also like to vary the speeds of the motors.
> If anyone can help me understand how to do this I would greatly
>appreciate the help. Thanks for the understanding as I am new to this.
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
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and off one at a time? by the way the max volt
draw the motors is 3 volts.
someone also suggested a duel h-bridge i have
the same question about controling one motor at a
time.
thank you
David