Simple Labs SLAEX039 L293D Motor Shield for Arduino

The L293D Motor Shield is a very useful shield with standard components. It 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. 2 connections for 5V 'hobby' servos connected to the Arduino's high-resolution dedicated timer: no jitter! 4 H-Bridges: L293D chipset provides 0.6A per bridge (1.2A peak) with thermal shutdown protection, internal kickback protection diodes. Can run motors on 4.5VDC to 25VDC. Up to 4 bi-directional DC motors with individual 8-bit speed selection (so, about 0.5 percent resolution) Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil or interleaved stepping. Pull down resistors keep motors disabled during power-up Big terminal block connectors to easily hook up wires (18-26AWG) and power Arduino reset button brought up top 2-pin terminal block and jumper to connect external power, for separate logic or motor supplies