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Power Seat controller.

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jdraughn

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I want to turn the hardwired power seat controls into a microcontroller controlled circuit using an analog joystick (like what is on a game controller).

Each seat has 3 motors and 3 switches, and each switch is in a normally open position, and when moved one way will send one polarity to it's motor, and when moved the other direction it will reverse polarity to the same motor.

If I use relays then I would need 4 relays per motor (h-bridge), and with 6 motors that would mean 24 relays!!!

Does anyone have any other thoughts on the best way control these motors from a microcontroller? I have thought about using mosfets but the only thing I would gain over relays is size because the mosfets required to pass that much current would cost quite a bit.
 

How much current does a motor require?
 

You'd only need 2 relays per motor, one for power t'other for direction, and a diode logic circuit to control the relay coils.
Better as you say to use mosfets, you can use a dual supply and only have 2 mosfets per motor, or one supply and 4 per motor.
 

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