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Expansion Board Base — XIAO Accessory Guide
Provides comprehensive reference for using the Seeed Studio Expansion Board Base with XIAO microcontrollers. Covers onboard OLED display (SSD1306 128×64 I2C), RTC (PCF8563), MicroSD card slot (SPI), passive buzzer, user button, Grove connectors (I2C×2, UART×1, A0/D0×1), battery charging, and 5V servo connector. Includes Arduino and TinyGo setup, wiring, pin usage, and code examples. Use when prototyping with the multi-function XIAO expansion board. Keywords: XIAO, expansion board, base, OLED, SSD1306, RTC, PCF8563, MicroSD, SD card, buzzer, button, Grove, I2C, SPI, servo, battery, prototyping, dashboard.