A motor shield is essentially an amplifier that converts the Arduino's 5 Volt PWM signal to a higher voltage (typically 12 Volts). Most of the ones available support two motors (and the TrainMotor ...

Arduino UNO compatiable Motor Shield R3 29250 DEEK-ROBOT - L298P DC Motor Driver Module 2A H-Bridge 2 way - Similar to DFRobot Motor Shield The Motor Shield is based on the L298, which is a dual ...

This shield could be a good alternative to hobby RC controllers for robots that need a customizable open-source motor controller. The PCB design and source code are available on GitHub.