computer motor controlling

[Andrew Howard]

I want to be able to fully control a motor through the parallel port. I am
aware how to make it simply turn on and off. The question is:
What is the easiest method of reversing the voltage to reverse the direction
of a motor? If anyone can direct me to a circuit diagram, that would be
great.

Also, what is the easiest method of controlling the speed? Make the parallel
port pulse? Special circuit somehow. If it is too complex, I could probably
live with manual control.

Thanks
Andrew Howard

 

[Russ Wizinsky - Professor]

You might want to try alt.machines.cnc. Best way a big motor, on my
Bridgeport and or lathe is by using a relay switch to switch the leads. Also
depends if it's a 3 phase motor or single phase. My Bridgeport which has a
single phase has a rotary switch that has to be hooked up into a relay to be
able to switch directions.
Russ





Russ Wizinsky

www.professorwiz.com
www.metalhobbies.com

 

[Steve]

"Andrew Howard" <andtfoot@hotpop.com> wrote in message news:<jyAbb.116819$bo1.82113@news-server.bigpond.net.au>...

I want to be able to fully control a motor through the parallel port. I am
aware how to make it simply turn on and off. The question is:
What is the easiest method of reversing the voltage to reverse the direction
of a motor? If anyone can direct me to a circuit diagram, that would be
great.

Also, what is the easiest method of controlling the speed? Make the parallel
port pulse?

Yup. Pulse width modulation is the answer to your speed control
question. Changing the duty cycle will alter the speed.

For direction control, connect the motor (perhaps via an L293D IC) to
two parallel port outputs, pulse output 1 and keep output 2 low for
one direction, pulse output 2 and keep output 1 low for the other
direction.

Check out the L293D IC here;
http://www.linuxfocus.org/common/src/article297/l293d.pdf

nifty

 

[R. Steve Walz]

Andrew Howard wrote:

I want to be able to fully control a motor through the parallel port. I am
aware how to make it simply turn on and off. The question is:
What is the easiest method of reversing the voltage to reverse the direction
of a motor? If anyone can direct me to a circuit diagram, that would be
great.
--------------

H-Bridge.

Also, what is the easiest method of controlling the speed?
Make the parallel port pulse?
-----------

PWM, pulse width modulation.

-Steve
--
-Steve Walz rstevew@armory.com ftp://ftp.armory.com/pub/user/rstevew
Electronics Site!! 1000's of Files and Dirs!! With Schematics Galore!!
http://www.armory.com/~rstevew or http://www.armory.com/~rstevew/Public

 

[Andrew Howard]

Thanks for the help. I had a brainstorm during my physics exam today;
thought of relays (dpdt ones specifically). I think it's probably the
easiest way.

Andrew

"Andrew Howard" <andtfoot@hotpop.com> wrote in message...

I want to be able to fully control a motor through the parallel port. I am
aware how to make it simply turn on and off. The question is:
What is the easiest method of reversing the voltage to reverse the
direction
of a motor? If anyone can direct me to a circuit diagram, that would be
great.

Also, what is the easiest method of controlling the speed? Make the
parallel
port pulse? Special circuit somehow. If it is too complex, I could
probably
live with manual control.

Thanks
Andrew Howard