Modular fan module

This module is a fan module that can be used with other small modules for some interesting applications (electric fans, heat dissipation, propellers). Not only can it be switched through the digital port of Arduino, but the speed can also be adjusted through PWM. Usually the port current of Arduino is too weak to drive the motor, so we integrate the driver and motor on this module and directly connect it to the main control board. Helped save a lot of trouble. Our common fire extinguishing trolleys can be installed with this fan for operation.