PiSugar 3 Plus is a third-generation expansion board in the PiSugar series, designed to make Raspberry Pi projects more portable and flexible. It offers a variety of practical features tailored for Raspberry Pi 3B, 3B+, and 4B models: Compact and GPIO-free installation: The back-contact design allows for a seamless setup without occupying the GPIO pins. Real-time clock (RTC): Maintains accurate time even without a network connection. Custom button: Can be programmed for power-on behavior or other interactive functions. Soft shutdown support: Ensures a safe system shutdown via hardware-triggered notification. Accidental touch protection: The precision switch design prevents unintentional system shutdowns. OTA firmware upgrade: Conveniently update your board's firmware over-the-air. Dual input ports: Supports both Type-C and Micro USB connectors for flexible setup. Web-based control interface: A built-in WebUI enables one-click configuration for various features. Software watchdog: Automatically restarts the Raspberry Pi when the system becomes unresponsive. I2C communication: Allows control and monitoring through configurable I2C addresses. Protective circuitry: Helps ensure long-term stable operation of the module. This module is ideal for DIY enthusiasts, developers, or makers looking for a compact, reliable, and smart accessory for portable Raspberry Pi applications.