L293D Arduino motor drive shield for Servo,Stepper And DC Motor 

Features

• 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.
• The Motor Shield is able to drive 2 servo motors, and has 8 half-bridge outputs for 2 stepper motors or 4 full H-bridge motor outputs or 8 half-bridge drivers, or a combination.
• Up to 4 bi-directional DC motors with individual 8-bit speed selection (about 0.5% resolution) 
• Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil, interleaved or micro-stepping. 
• 4 H-Bridges: L293D chipset provides 0.6A per bridge (1.2A peak) with thermal shutdown protection, 4.5V to12V 
• Pull down resistors keep motors disabled during power-up 
• Big terminal block connectors to easily hook up wires (10-22AWG) and power 
• Arduino reset button brought up top
• 2-pin terminal block to connect external power, for seperate logic/motor supplies 
• compatible with UNO,Mega, Diecimila, & Duemilanove
• Dimensions: 69mm x 53mm x 14.3mm (2.7in x 2.1in x 0.6in).