Using a DPDT to automatically reverse the polarity of motor

Discussion in 'The Projects Forum' started by janej, Aug 20, 2010.

  1. janej

    Thread Starter New Member

    Aug 20, 2010
    1
    0
    I am currently working on a project that requires a motor to run this way and then hit a switch that would enable it to reverse its polarity. However, I have to wait for a signal from an LDR and this signal is what would drive the motor the other way.

    Is there an automatic DPDT switch that I could use?

    Thanks!
     
  2. marshallf3

    Well-Known Member

    Jul 26, 2010
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    "All in one" I seriously doubt, easy to build with minimal components - yes.

    Voltage & current requirements of the motor?
     
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    This is a circuit I whipped up awhile back for a fellow who used it in a model of a German WWII Tiger Tank:

    [​IMG]

    It could probably be modified to suit your needs, but you'll need to give more specifics about your LDR and it's resistance when illuminated and dark.

    The diagram shows two relays. The actual relay used was a dual form C H-bridge relay, NEC EP2 series. These are available from Mouser.com
    You don't have to use an H-bridge relay though; a pair of SPDT relays could be used.
     
    Last edited: Aug 20, 2010
  5. soda

    Active Member

    Dec 7, 2008
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    I add a pic of how you can use a DPDT switch to reverse the motor direction. I use it all the time with no problems
     
  6. williamj

    Active Member

    Sep 3, 2009
    180
    32
    janej,

    We need to know more about the motor, is it AC or DC, if AC... is it single phase or three phase. For a good circuit, accurate motor information is paramount.

    williamj
     
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