This is a motor shield for Arduino that will control two DC motors. Based on the L298 H-bridge, the Ardumoto can drive up to 2 amps per channel. The board takes its power from the same Vin line as the Arduino board,  includes blue and yellow LEDs to indicate active direction, and all driver lines are diode protected from back EMF. Control for motor attached to OUT1/2 is connected to digital line 12 (direction A) and digital line 3 (PWM A). Control for motor attached to OUT3/4 is connected to digital line 13 (direction B) and digital line 11 (PWM B). Compatible screw terminals and connectors are listed below. Project description, more information and ordering can be found at https://www.sparkfun.com/products/9213 L298 H Bridge data sheet: http://www.sparkfun.com/datasheets/Robotics/L298_H_Bridge.pdf Example Arduino sketch: http://www.sparkfun.com/Code/Ardumoto_test_2.zip