STMicroelectronics boards
2 STMicroelectronics development boards — pinouts, specs, and datasheets.
STMicroelectronics · STM32F103C8T6
The 'Blue Pill' is a low-cost STM32F103C8T6 (Cortex-M3, 72 MHz) dev board with two 20-pin headers and a 4-pin SWD header. 3.3V logic (most pins 5V-tolerant). Rich peripherals: 3x USART, 2x SPI, 2x I2C, CAN, USB, and 10 ADC channels.
STM32 Nucleo-64
board
STMicroelectronics · STM32 (LQFP64)
ST's Nucleo-64 boards take any LQFP64 STM32 and expose it on Arduino Uno R3-compatible headers plus ST Morpho headers, with an onboard ST-LINK debugger. The Arduino-header layout below is consistent across Nucleo-64 boards; the exact STM32 pin behind each (shown for the common F4-series) and the Morpho pins vary by MCU.