Using a DPDT to automatically reverse the polarity of motor

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

  1. janej

    janej Thread Starter New Member

    Joined:
    Aug 20, 2010
    Messages:
    1
    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

    marshallf3 Well-Known Member

    Joined:
    Jul 26, 2010
    Messages:
    2,358
    Location:
    Oklahoma City, OK. Large enough to be modern but p
    "All in one" I seriously doubt, easy to build with minimal components - yes.

    Voltage & current requirements of the motor?
  3. mcgyvr

    mcgyvr Senior Member

    Joined:
    Oct 15, 2009
    Messages:
    3,257
    Location:
    North Carolina, USA
  4. SgtWookie

    SgtWookie Expert

    Joined:
    Jul 17, 2007
    Messages:
    22,094
    Location:
    In the vast midwest of the USA; CST
    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.

    Attached Files:

    Last edited: Aug 20, 2010
  5. soda

    soda Active Member

    Joined:
    Dec 7, 2008
    Messages:
    174
    Location:
    Worcester(Western Cape),South Africa(GMT+02:00)
    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

    Attached Files:

  6. williamj

    williamj Active Member

    Joined:
    Sep 3, 2009
    Messages:
    177
    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
Similar Threads
Forum Title Date
The Projects Forum How can I switch between 2 LEDs using a momentary DPDT switch? Apr 25, 2014
The Projects Forum DPDT switch using MOSFETs Jul 1, 2011
The Projects Forum Using DPDT Switch To Control All Three Colors Of An RGB LED Feb 2, 2010
The Projects Forum Problems using 4000 ic Yesterday at 10:43 AM
The Projects Forum 9-0 Counter using J-K Flip Flop Oct 15, 2014

Share This Page