Small DC motor control

[Huegee]

Hello, I need some help in controlling a window blind. What I have is a 12VDC at 8 Amp power supply connected to a 3 pole wall switch that controls a DC motor. The wall switch has up position for forward (close blind), a cross wired down position, flipped polarity, for reverse (open blind) and a center position for no voltage to the motor. At the end of travel for the blind a micro switch stops the motor. What I want to do is replace the 3 pole switch with a motor control driver that can be controlled with a control relay or RS232. All the driver will have to do is be able to handle the 12 VDC 8 Amps supply and load and be able to flip the polarity to the DC motor to run it forward and reverse. Plus have an OFF or no voltage position so I can stop the blind in mid travel. I came across a motor control from Penta Power that will do this and more, the KBBC-24M 9500. However this neat little controller does more than I need and cost too much, about $266 per unit. Is there another controller out there that will do what I need and be less expensive? I know I can come up with a couple of DPDT power relays and throw them in a box but I am shooting for a better solution.
Thanks.

 

[OperaHouse]

go to

http://www.electronics123.com

for some cheap kits. Maybe you can adjust your thinking to match one of these.

 

[jbartos]

Suggestion: There may be way to control simply; however, to buy components needed one by one may become expensive too. Also, the feature that are useful need to be considered, e.g. the motor accurate protection. There will be a need for DC relay, and switches/push buttons to control it.
Visit

http://www.motor-ez.com/motor/motor...string=Motors&seq=1&uuid=THezsrch&ezlocation=

http://www.motor-ez.com/motor/0005344_0056769_1.html

http://www.motor-ez.com/motor/motor...string=Motors&seq=1&uuid=THezsrch&ezlocation=

http://www.motor-ez.com/motor/0005344_0056769_1.html

etc. for more info

 

[Huegee]

Thanks for the input guys, but I still can't find anything that will work that won't cost an arm and a leg. Even a reversing contactor is expensive if I could find one that would be the right voltage. Well I guess I will buy a box and put some relays in it and control my motor that way. I would think with all of the home automation out there it would be a breeze to find small motor controls. I guess everyone builds there own proprietary equipment and doesn’t worry about interfacing with other automation.
Anyway thanks for the help.

 

[jbartos]

Suggestion: The DC relays with higher current rating of their contacts might be used. They are less expensive; however, they are not inexpensive either.
Visit:

http://www.thomasregister.com

and type relays: dc under product or service, which will return 49 companies to approach to