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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.
Four H-Bridges : Two L293D Motor driver chips L293D is rated at 0.6A per bridge (1.2A peak) with thermal shutdown protection, internal kickback protection diodes Motor Voltages from 4.5VDC to 16VDC. (up to 36V if C6 and C7 are upgraded) Up to 4 bi-directional DC motors with individual 8-bit speed selection (256 speeds) Up to 2 stepper motors (unipolar or bipolar) Pull down resistors keep motors disabled during power-up Separate Logic and Motor power connections Terminal block connectors for motors and power 2 connections for 5V 'hobby' servos
Extra Chips 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.
Able to Drive 2 Servo Motors 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.
Connection Points The servo motors use the 5V of the Arduino board. The voltage regulator on the Arduino board could get hot. To avoid this, the newer Motor Shields have connection points for a seperate 5V for the servo motors.