The Sparkfun Ardumoto shield for Arduino 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 10 (PWM A).
Control for motor attached to OUT3/4 is connected to digital line 13 (direction B) and digital line 11 (PWM B).
The VIN connection is tied directly to the VIN on the Arduino, so make sure to not apply power to both.
We will solder the Arduino headers onto the board for a small fee.