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The SH1002 Rainbow Carousel Themed Expansion Board integrates 24 programmable WS2812B RGB LEDs, one analog potentiometer input, one 1W audio amplifier (with onboard speaker), four tactile push buttons (GPIO‑to‑GND), and one 180‑degree MG90 metal‑gear servo. When paired with BIT.U1 or BIT.S3 development boards, it enables rich programming effects for the WS2812B LEDs, which are arranged in a semicircular rainbow pattern for creating vibrant lighting displays. Combined with the push buttons and servo, it supports interactive projects such as a randomized lucky wheel draw. By connecting external modules, it can also be extended to voice‑control applications or metal‑detector projects. The board is designed for use with Bit‑Tree’s companion textbook *Project‑Based Creative Programming*. It features a front panel made of black light‑transmitting acrylic and a fully transparent rear acrylic panel for easy observation during learning. Packaged in an eco‑friendly PP plastic case for storage and protection, it comes with a detailed product manual covering all specifications and interfaces.
