Arduino Motor driver shield

A Motor driver shield for Arduino boards that can control up to 4 bi-directional DC motors with individual 8-bit speed selection, or 2 stepper motors (unipolar or bipolar) with single coil, double coil, interleaved or micro-stepping. 2 connections for 5V 'hobby' servos connected to the Arduino's high-resolution dedicated timer - no jitter!
The shield contains two L293D motor drivers and one 74HC595 shift register. The shift register expands 3 pins of the Arduino to 8 pins to control the direction for the motor drivers. The output enable of the L293D is directly connected to PWM outputs of the Arduino.
To increase the maximum current, the L293D allows extra chips with "piggyback". Piggyback is soldering one or two or three extra L293D drivers on top of the L293D drivers on the board to increase the maximum current. The L293D allows parallel operation.
Features:
Supplied Fully Assembled
2x 5V Servo outputs connected to the high-resolution dedicated timer - no jitter!
Can drive 4 DC motors or 2 stepper motors or 2 Servo's
Up to 4 bi-directional DC motors with individual 8-bit speed selection
Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil or interleaved stepping.
4 H-Bridges: per bridge provides 0.6A (1.2A peak current) with thermal protection, can run motors on 4.5V to 36V DC
Pull down resistors keep motors disabled during power-up
reset button
Tested compatible for Mega, Diecimila, Duemilanove, UNO
Power Supply
Power for the motors can be supplied from the Arduino boards DC Jack (normally 9V) or from the 2-pin EXT-PWR terminal block.
If you are supplying power from the EXT_PWR terminal block you should remove the PWR jumper or you could damage the shield and the Arduino board.

Getting Started