HMI Module is a human-computer interactive module that provides rotary encoder, two input buttons and two LED indicators, using STM32F030 as the acquisition and communication MCU, and communicating with the M5 host through I2C. In addition, there are portB and portC interfaces on the module, and a 500mAh lithium battery is built-in. The module is suitable for a variety of applications that require handheld operator interaction.