12V Motor Control

Using Arduino Motors, Mechanics, Power and CNC
1

Hopefully this is the best forum sub group to put this under. Does anyone know of or could recommend a product and/or schematic of something that could do this?

I'm looking for a device that can control the speed of a motor from a 12V power supply given digital or PWM signals. Specs I need:
12V input power supply and output varying 0V-12V
No more than 2A will be drawn (small current rating is fine)
hopefully small! I'm looking to downsize my current controllers.

Thanks in advance for any help!
Cade

2

Use a L298. The datasheet has example circuits.

3

One direction only? PWM into Logic Level, Low Rds, N-channel MOSFET.
AOI514 from Digikey

4

What's the motor? 2A is full load or stall current?

5

Since this seems to be the exact same question I have, I was hoping I could join in on this discussion and not clutter the forum with a clone of this thread.

I am also trying to run 12V motors (4) in two directions at variable speeds (analog) using an Arduino Uno as the processor. I was hoping to find some guidance as to how to do this or where I could look to for a how-to. I've spent a ton of time on google and this forum but keep getting very lost in the technical talk. Thanks for any help in advance and let me know if you need any other clarifying information.

6

Again, use a motor driver shield or a L298. The L298 can supply up to 2A. The L293D can supply only 600mA.

7

L298 shields get pretty hot at 2A.
I'd go with an MOSFET H-bridge driver from Pololu
Can be pricier, but will run cooler and last longer.

8

Pololu makes good stuff.

9

An L298 without a heatsink cannot handle 2A continuous, it will overheat.

Any motor controller capable of 12V or more and 2A or more is what you want. Its obvious
really if you think about it.

Such motor controllers for DC motors are also known as H-bridges as they are a bridged configuration
of 4 switching devices looking like an H in the circuit diagram.

MOSFET H-bridges are superior, but not necessarily cheap or easy to source.

Look at the Pololu range to get an idea of what's available.