Product introduction: This expansion board is a full-featured robot expansion board that supports multiple motors, stepper motors, and servos simultaneously. It can be stacked to expand more control interfaces, making it ideal for various applications such as DIY robots, smart cars, robotic arms, tilts, and more. The control interface uses the I2C protocol and is compatible with 3.3V and 5V logic levels, making it suitable for use with various development boards available on the market. Note: Product appearance, color, and printed markings may vary between batches. These variations do not affect functionality. Features: 1. Single power supply with a normal operating voltage range of 5V to 12V. (Select the appropriate input voltage and current based on the motor requirements.) 2. Full data input/output via I2C bus. 3. One I2C interface compatible with 5V logic level, controllable by microcontrollers or other development boards. 4. One I2C interface can connect to various sensors to enable extended application functionality. 5. Expansion board address is set using 4 address pins, allowing up to 16 expansion boards to be used simultaneously. 6. Supports 16 PWM channel outputs, capable of controlling 16 servos or LED lights. 7. 12-bit resolution with adjustable PWM frequency up to 1.6 kHz; supports configurable push-pull or open-drain output. 8. Supports 4 servo interfaces with 3-pin standard connectors for easy connection of servos and LED lights. 9. Supports 2 channels of 6V to 12V stepper motors and 4 channels of 6V to 12V geared motors. 10. Includes infrared receiver functionality for convenient infrared remote control. Specifications: Working voltage: 5V to 12V Interface: I2C Interfaces: 1. 4 servo interfaces (#0, #1, #14, #15) 2. 4 motor interfaces (M1, M2, M3, M4) 3. 2 stepper motor interfaces (M1+M2, M3+M4) 4. I2C interface