Hi-
In searching previous posts I see a few similar to what I need to do but being such a novice I cannot tell if they would apply.

Using the dc motor from an old automatic litter box, a remote controlled polarity switch, and a 12V 1amp AC adapter, I'm able to control the opening/closing of the hen house door from inside the house.

I don't know diagrams but the AC adapter output connects to the red and black wires on the switch. The two white wires from the switch connect to the motor. Pressing and holding one of two buttons on the remote controls the polarity.

I want to be able to shut off power to the motor when it reaches the top/bottom limit but allow for the return trip. I figure I need to put a micro switch between each white wire and the motor. Obviously by themselves they're not going to work that way. So I need your help.

Thanks!

 

put diodes across your limit switches.

 

Like this..

 

Excellent. Thanks.

12V DC, do the diodes have to be anything special. There's a few of them on the litter box circuit board. Probably good enough?

 

As long as they aren't glass looking or zener diodes, they should work because 1 amp diodes are very common.