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Author Topic: 24v speed/direction controller circuit  (Read 1019 times)
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I have a power source (24vDC with 1Amp max.), and I want to be able to control it (like a PWM signal) all the way from off to 24v, and also to be able to switch polarity.  Does anybody know how to set this up with arduino?  A relay is able to turn it off or on, but it isn't able to handle all of the states in the middle (10% power, 25% power, etc.).

Does anybody know how to build an Arduino-controllable circuit to do this?

By the way, if it matters, this is a speed/direction control for a DC motor.
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Google 'arduino motor shield' or 'H-bridge'.
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to my knowledge, the arduino motor shield only supports loads up to 18 volts.

I was hoping that there might be a cheaper solution than that. 30$ is a little steep.

I was thinking that maybe a couple of transistors could do something like this, but I don't quite know which ones I'm looking for, or how to set them up for that matter.
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to my knowledge, the arduino motor shield only supports loads up to 18 volts.
See http://www.adafruit.com/products/81
That one supports up to 25V.
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I was hoping that there might be a cheaper solution than that. 30$ is a little steep.

I was thinking that maybe a couple of transistors could do something like this, but I don't quite know which ones I'm looking for, or how to set them up for that matter.
Did you look up H-bridge?
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Did you look up H-bridge?
I know that H-bridges work to reverse the direction of the flow, but they don't do anything for speed as far as I can see.
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H-bridges can be given PWM to change the speed control.
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Did you look up H-bridge?
I know that H-bridges work to reverse the direction of the flow, but they don't do anything for speed as far as I can see.

Look up H-Bridge with an enable signal.
Or Switching Power Supplies.
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H-bridge like below might work for you.

http://www.ebay.com/itm/Double-BTS7960-43A-H-bridge-Motor-Driver-module-smart-car-driver-For-Arduino-/161045865372?pt=LH_DefaultDomain_0&hash=item257f14e39c
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