Easy start for prototyping: write code with minimal configuration and access rich sensor driver and communication protocol libraries, lowering the development threshold for rapid prototyping. Upgraded microcontroller: equipped with ATmega328P (5V/16MHz) to support embedded development while keeping a compact form factor. Low power and versatile: ideal for makers, educators, and developers seeking a low power solution for battery powered prototypes such as wearable devices or environmental systems. Compact I O and interfaces: miniature design with 14 digital GPIO pins and I2C and UART interfaces for sensor and actuator integration in space constrained projects. 23 practical use scenarios Wearable prototype: suitable for battery powered wearable devices where small size and low power are important, enabling simple sensor integration and control. Remote environmental sensing: ideal for remote or portable environmental monitoring nodes using I2C sensors and UART devices in a compact package. Education and maker projects: supports classroom or hobbyist projects that require quick setup, sensor connectivity, and straightforward microcontroller development.