It can drive : 4 bi-directional DC motors with 8-bit speed selection 2 stepper motors unipolar or bipolar with single coil, double coil, interleaved or micro-stepping. As the shield comes with two LD motor driver chipsets, that means it can individually drive up to four DC motors making it ideal for building four-wheel robot platforms. The shield offers total 4 H-Bridges and each H-bridge can deliver up to 0. The shield also comes with a 74HC shift register that extends 4 digital pins of the Arduino to the 8 direction control pins of two LD chips.
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The ld can drive small and quiet big motors as well, check the Voltage Specification at the end of this page for more info. You can find the necessary pin diagram, working, a circuit diagram, Logic description and Project as you read through. Concept It works on the concept of H-bridge. H-bridge is a circuit which allows the voltage to be flown in either direction.
As you know voltage need to change its direction for being able to rotate the motor in clockwise or anticlockwise direction, Hence H-bridge IC are ideal for driving a DC motor. In a single LD chip there are two h-Bridge circuit inside the IC which can rotate two dc motor independently. Due its size it is very much used in robotic application for controlling DC motors. Given below is the pin diagram of a LD motor controller. There are two Enable pins on ld. Pin 1 and pin 9, for being able to drive the motor, the pin 1 and 9 need to be high.
For driving the motor with left H-bridge you need to enable pin 1 to high. And for right H-Bridge you need to make the pin 9 to high. If anyone of the either pin1 or pin9 goes low then the motor in the corresponding section will suspend working.
Control DC Motors with L293D Motor Driver IC & Arduino
Control DC, Stepper & Servo with L293D Motor Driver Shield & Arduino