I need a simple electronic circuit that will help me accomplish what is depicted in the attached pic. This is for a more personal project but I know there is talent in this forum and I am no "wizzard" with electronics.

Basically when the switch is off I want the motor to turn in one direction indefinitely until and if it hits a stop at which point its Voltage would drop and its current would go sky high and then it shuts off (I'm guessing a current limiting or voltage drop cut off can be used)

When the switch is placed in the on position(12V) i want the motor to run in the opposite direction (reverse polarity) until and if it hits a stop at which point it shuts off again.

Any help is greatly appreciated.

Best regards,

Chris

 

How big is the motor - in terms of current / power rating required ?

A couple of change over relays with suitable electronics or mosfet motor drive circuit - if you do a search on the web you could find something suitable. Sounds like fairly simple control logic is what you want - maybe a modified window winder module might work (the sort that come with alarms to wind up all the windows when you set it) ?

 

I searched lots....so far I've only found this that meets my requirements but it is made in Germany and they don't have distributors in the US.

http://www.electromen.com/commondata/vkem-140a.pdf


Any insight?

Thanks.

Chris