The Unit ChainBus is a communication protocol conversion unit in the Chain series. It integrates an STM32G031G8U6 chip and uses a UART serial cascading communication protocol to achieve chained connections of multiple devices. It supports multiple protocol interface conversions, and a single bus can be used to connect various peripherals. It also integrates hardware control and data interaction capabilities. The UART interfaces on the left and right sides of this unit are used to connect Chain series devices, supporting functions such as device UID lookup, version lookup, link device enumeration, and heartbeat communication. The multi-functional expansion interface on the top can be used to expand Unit series devices, supporting I2C communication control, GPIO management (input and output), ADC acquisition, and NVIC interrupt management. It is suitable for industrial control, IoT, smart home, and other fields, providing an effective solution for unified management and data interaction of multiple devices. Color: White Material: plastic Package Contents: 1 set of for M5Stack Unit ChainBUS Only the above package content, other products are not included. Note: Light reflection 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.