STM32F103C8T6 ARM Cortex-M3 (Blue Pill)

The 'Blue Pill' is a high-performance development board based on the ST Microelectronics STM32F103C8T6 ARM Cortex-M3 microcontroller. Running at 72MHz with 64KB Flash and 20KB SRAM, it offers significantly more computational power and I/O speed than the Arduino Uno. It features native USB support, dual 12-bit ADCs, and advanced timers, making it the preferred choice for flight controllers, motor drivers, and complex math processing.