1. When the external PWM signal is input, the amplitude is 5V, and the recommended PWM frequency is 1K-10KHz. 2. For analog input, you can use the on-board 5V, GND external potentiometer ( 10K-100Kohm) to adjust the speed, or you can input (0-5V) analog externally, but it needs to be connected to the GND on the board. 3. For forward and reverse rotation control, the motor needs to stop rotating and then perform forward and reverse operation. It is strictly forbidden to change direction during the rotation of the motor, which will cause damage to the circuit board. In addition, after removing the short-circuit cap, the steering switch can be connected externally for operation. 4. 5V, GND The motherboard comes with a 5V supply (external supply can be provided, the current does not exceed 10mA) 5. Speed pulse signal output, the amplitude is 5V, each pulse represents one revolution of the motor. Precautions: 1. There is no fuse in the supply circuit on the main board. has added it himself. Reverse connection of the positive and negative poles of the supply will cause permanent damage to some chips on the board. 2. There is sampling over-current protection at the output of the motor during normal operation. Because the and current of the module are very , please do not artificially short-circuit the module when the module is not working normally. Once the short-circuit, the circuit may be burnt and the tube may burst. Please use small current and low voltage test, after ok, then apply high current and high voltage. Because it is a bare board module, please pay attention to the insulation of the wiring head. It is strictly forbidden that strong voltage contact the board parts. 3. When the operating of module exceeds 100W or the operating environment exceeds 30Celsius, in order to the normal operation of the circuit for a long time, it is necessary to provide external cooling for the circuit board for heat dissipation. Model Number: PWM Hall Motor Controller Motor Type: DC Motor colour:Black Material:plastic size:80 x 30 x 10mm Package Contents: 1 x 200W brushless DC motor driver Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.