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Picture of How to control a DC motor to run in both directions
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Those H-bridges are very useful and smart, but if you just want to control the direction of the motor with a switch (manually), there is a much simpler and cheaper alternative.

This little circuit is perfect for newbies. I've known this circuit for several years now, but I didn't got the idea of posting it until now.



 
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Step 1: Parts needed

Picture of Parts needed
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The parts, you need to make this can be found in any electronic store, or even lying around in your workshop (if you have any).

You'll need:

  • A DC motor.
  • A Double pole a.k.a. DPDT switch. preferably one with a center OFF position, so you can control the motor like this: Forward, stop and backwards.
  • A Power supply that suits the specs of the motor (has the voltage and amperage as the manufacturer of the motor recommends). In my case it was 2 AA batteries.
  • A Batteryholder (if you use batteries).
  • Some wire.

Step 2: Assemble it

I don't think, this could be easier. Just follow my pictures.

Step 3: Applications

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When I learned to make this circuit (I think I was 9 years old) I made a simple, little car that could drive forwards and backwards.

Now all you newbies out there: go make some creative with this circuit and post some pictures of it.
neardood6 years ago
wow that is really simple! when I tried to do something like that I used heaps of diodes and sh1t like that but this works even better. Too bad I dont have a three-way switch like that on in my workshop anyway...
You could just use a 2 position switch and a separate switch to turn it on and off.
how would you do that
rwhite191 year ago
for some reason I thought i would need a servo and micro controller to control the direction of something thanks so much
abhinavrana4 years ago
u have not mention the mechanism of seperate switch so plz do it .................
ricwip555 years ago
Good clear instructable. This is a question rather than a comment: can this be 'scaled' or 'beefed' up to switch a 12v starter motor running off a car battery ? Much higher currents - I'm trying to build a boat trailer 'tractor' . Thank you.
 Sure, That would be possible. You'll just need a pretty heavy duty switch!