Adafruit Motor / Stepper / Servo Shield for Arduino v2 Kit - v2.3

This shield will make quick work of your next robotics project! The original Adafruit Motorshield kit is one of Adafruit's most beloved kits, which is why they decided to make something even better. They have upgraded the shield kit to make the bestest, easiest way to drive DC and Stepper motors. This shield will make quick work of your next robotics project! We kept the ability to drive up to 4 DC motors or 2 stepper motors, but added many improvements:

• Fully dedicated PWM driver chip onboard handles all motor and speed controls over I2C
• Only 2 pins, SDA and SCL, required to drive multiple motors and since its I2C you can also connect any other I2C devices or shields to the same pins. This also makes it drop-in compatible with any Arduino, such as the Uno, Leonardo and Mega R3. (Due's Wire support is still in beta, but once that works well we can test it on the Due)
• completely stackable design: 5 address-select pins means up to 32 stackable shields!
• 2 connections for 5V 'hobby' servos connected to the Arduino's high-resolution dedicated timer - no jitter!
• 4 H-Bridges: TB6612 chipset provides 1.2A per bridge (3A peak) with thermal shutdown protection, internal kickback protection diodes. Can run motors on 4.5VDC to 13.5VDC.
• Up to 4 bi-directional DC motors with individual 8-bit speed selection (so, about 0.5% resolution)
• Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil, interleaved or micro-stepping.
• Motors automatically disabled on power-up
• Big terminal block connectors to easily hook up wires (18-26AWG) and power
• Arduino reset button brought up top
• Polarity protected 2-pin terminal block and jumper to connect external power, for separate logic/motor supplies
• Tested compatible with Arduino UNO, Leonardo, ADK/Mega R3, Diecimila & Duemilanove. Works with Mega/ADK R2 and earlier with 2 wire jumpers.

The nice folks at Adafruit have also put together this handy tutorial which includes documentation and example code, check it out!