Controlling motors using the L293D motor driver shield and Arduinoīefore using the L293D motor driver shield with Arduino IDE, we need to install the AFMotor.h library. In this case make sure the jumper is removed from the motor shield. You can also use two separate power supplies for Arduino and motors for example you can power the Arduino through the USB and the motor powered off of a DC power supply or use two separate DC power supplies for the Arduino and motors. This method is best if the motor supply voltage is less than 12V. Make sure the power jumper on the motor shield is in place. If you are using a single power supply for both Arduino and motors, simply plug it into the DC jack of the Arduino board or use the EXT_PWR block on the shield. Power Supply considerations for the L293D motor driver. The shield also comes with a 74HC595 shift register that extends 4 digital pins of the Arduino to the 8 direction control pins of two L293D chips. This shield offers total four H-Bridges and each H-bridge can deliver up to 0.6A to the motor. The L293D is a dual-channel H-Bridge motor driver capable of driving a pair of DC motors or single stepper motor.
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