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46  Forum 2005-2010 (read only) / Interfacing / Minimal DC Motor control circuit question on: August 17, 2010, 04:06:06 pm
Hi, I want to control a 7v DC motor using an ATMega328P with a LM293DNE as an HBridge for reversing the motor on demand.  

I want to keep the circuit as tiny as possible, preferably fitting in the palm of your hand so I would like to run the arduino and the motor off the same battery, maybe a 9v?

The motor will run at very small intervals at a time, 3 seconds forwards then 3 seconds back so I am not too worried about battery consumption. It only needs to run once.

Just wondered what the general opinion is on the best way of doing this, power-wise. I am worried about interference from the motor on the arduino when using the same power source, is this an issue if I am using the H-bridge?

If I want to do this do I run the 7v through the arduino and pass it through to the motor or should I split the battery into two supplies?

It will basically run like this.

Power On
Push button1 - motor runs forwards for 3 seconds then stops
push button2 - motor runs backwards for 3 seconds then stops.
Power Off

Thanks in advance
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