dc motor control with 2 on/off switches

Discussion in 'The Projects Forum' started by lewa2702, Jan 31, 2013.

  1. lewa2702

    Thread Starter New Member

    Jan 31, 2013
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    0
    Hey guys. Just wondering if anyone knows how would I connect two separate on/off momentary push switches to control 12v dc motor. One moving the motor in one direction, second one in the other. I found the diagram on how to bridge one toggle on/off/on switch to reverse polarity but cant find any which show doing it with two separate switches. Also found some on/off momentary switches which have 2 prongs in back and some have 3. Any recommendations on which switches to use and how to connect them would be appreciated.
    Thx
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    If all you want is direction selection, two double-pole, single-throw(DPST) switches(properly rated) can do this. Referring to this image:
    [​IMG]
    switches s3 and s2 would be one switch, where s1 and s4 would be the other. closing s3 and s2 causes current to flow one way through the motor;with only s1 and s4 closed, current would flow in the opposite direction, changing the direction of the motor.

    Note: NEVER EVER leave both switches on at the same time! This shorts your supply...
     
  3. lewa2702

    Thread Starter New Member

    Jan 31, 2013
    2
    0
    Thanks for help
     
  4. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    No problem, by the way, this is called a H-Bridge layout....
     
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