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[on:]

Hello All,

I am new to Arduino and PhyComp but have my Arduino up and running and have been playing around with a few of the tutorials. Now what I want to do is control a small DC motor, as an Analog out, with a variety of speeds, but do not need to reverse the direction...

How do I set this up? - I believe motors feedback to the circuit which can damage things? Any advice or photos appreciated...

Thanks!

[Reply #1 on:]

hey,

you need two things: a driver circuit to flip the polarity of the motor connections ( to change the direction) and something to tell the motor what speed to go at.

The standard way to drive  a motor in reverse and forward is called an "H bridge". There is a simple one
here. It will actually drive two motors in both directions. A Dout pin will tell the motor which way to go.

The same board takes an input pulse to determine the speed. this is a digital PWM pulse that is generated in the Arduino-- you would not want to use an Aout pin. If you read up a bit on PWM motor control, you can then easily modify the RC servo code for the arduino to drive your motor at variable speeds.  

[Reply #2 on:]

Can someone recommend a cheap/good H-bridge in the UK?