Re: [CAD_CAM_EDM_DRO] Simple Parallel Port controller

> I am looking for some help to use my parallel port to turn off and on a
> small relay switch. The device I want to control will shut off

automatically

> after 1 cycle but it needs a 1 second ON switch to activate it. What I am
> doing is turning a small motor on and it will turn one revolution and then
> stop when the cam lobe on the pulley hits the switch lever to stop it. I
> need the computer to turn the relay on to start the motor moving. The

motor

> is just a plain motor 12V not a stepper or servo. I will have the final
> drive slowed way down with a pulley so the switch cycle will take 3-4
> seconds. I have seen some simple controller boards for small servo motors
> for about $50 but All I need is a Off and ON switch. I would appreciate

any

> help.
>
> Thanks
> Scott

What you want is called a opm-5 from greyhill or omron. There would be some
twiddling with pullup resistors. Hook the motor up to 12 volts on one side
and use
the relay to pull down the other side. Then you just have to learn how to
use the
parallel port to output a signal.
Eric