Without having much knowledge about this I bought the cheapest motor controller board I've found, a fully assembled version of the Adafruit motor shield at Amazon for $13.99. ![]() ![]() ![]() There is a specialized circuit called an H-Bridge that can do this, and there are several implementations of this circuit readily available for the Arduino platform, or you can also build one from basic parts for next to nothing. The tricky part is to be able to make the motor selectively run forward or backwards, which requires swapping power and ground inputs into the motor. The Arduino board cannot directly control a motor. My recommendation: Arduino Uno R3, currently $21.95 at Amazon. There are plenty of Arduino models or even Arduino compatible boards that can be used. My son had an old Arduino Uno that he ended up not using, so I did not need to buy one. The Arduino board will be the brain of the robot, as it will be running the software that will control all the other parts. With the above feature list in hand I went on to research what parts I needed for my project.
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