product description: Module interface description: 1. VM: The power supply of module is input according to the parameters of the motor, and the measured range is 7.6~40V 2. VCC: connect to 5V input, do not input 3.3V, otherwise it will affect the performance 3. GND: is the ground pin Color: green Material: PCB+Metal Control example (when the above 3 pins are connected) Task 1: A motor rotates forward with a duty cycle of 50% Solution: 2 lines of motor A are connected to AOUT1, AOUT2, AIN1 respectively, connected to low level, AIN2 is connected to 50% PWMO Task 2: B motor reverse, duty cycle 20% Solution: The two wires of motor B are connected to BOUT1 and BOUT2 respectively. BIN1 is connected to high level, BIN2 is connected to 20% PWM (If your PWM frequency is relatively high, such as 10KHz, you need 2 PWM pins to control the forward and reverse rotation. If you use 's default PWM frequency of 500HZ. You can use a 10 and a PWM pin to control the forward and reverse rotation, But the effect is not as good as 2 PWM pins) Specification: Function: It can control the forward and reverse rotation of 2 motors (for example, only one of this module is needed for a balance car) Voltage: 7.6~40V Current: The module has current limiting protection, 2A (overcurrent will not power off, only limit the maximum output current Control: 4 PWM pins are required, (if inversion is not required, only 2 PWM pins are required) It is much simpler to use than 298 Product size: 23 x 18.3mm Lead out: 2 rows of 7pin pin headers Spacing: 20mm Package Contents: 2 x motor driver module 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.