Arduino平台用霍尔开关传感器测量电机转速，电机上需加磁铁，也可通过Arduino编程输出500HZ脉冲来模拟电机转速。这两者均已验证。(The Arduino platform uses the Holzer switch sensor to measure the motor speed. The motor needs to add magnets to the motor, and the 500HZ pulse can be output by Arduino to simulate the motor speed. Both of them have been verified.)