L293d Shield Wiring Diagram. The motor driver shield has two l293d motor driver ic. L293d pin diagram.
All necessary information are provided in the image and it is self explanatory. Input high state enabled. This pin is used to control speed of a motor by connecting it to one of your arduinos pwm pin.
The shield also comes with a 74hc595 shift register that extends 4 digital pins.
And after this this is actually the 1st photograph. The shield has several important components. Control up to 4 dc motors. When the pin is high it enables the driver channels 1 and 2.