The Gravity series is a comprehensive, open-source modular electronics ecosystem renowned for its extensive library of over 250 functional modules. It distinguishes itself with a vast array of specialized sensors, ranging from industrial-grade water quality monitoring (pH, EC, DO) and precision gas detection to advanced mmWave human presence radar. Featuring a standardized interface with color-coded cables and reverse polarity protection, Gravity ensures seamless connectivity across diverse controllers including Arduino, micro:bit, ESP32, Raspberry Pi, and the UNIHIKER series. This Wiki provides detailed datasheets and example codes to help developers leverage these rich sensor resources.