XIAO ESP32C3’s RISC-V single-core 32-bit processor running at 160 MHz delivers surprisingly capable BLE and Wi-Fi performance in a package smaller than a postage stamp. Eleven GPIO pins broken out on two rows include SPI, I2C, UART, ADC, and PWM, offering rich peripheral support despite the tiny footprint. U.FL antenna connector and onboard PCB antenna options let designers choose between compact integration and extended range. Deep sleep power consumption of 43 µA suits battery-operated edge sensors needing multi-month autonomy. Arduino IDE and MicroPython support lower the barrier for rapid prototype development.