STM32 "Blue Pill" is a popular, and cheap (>$2) development board based on STMicro STM32F103C8T6 Arm Cortex-M3 microcontroller and programmable with the Arduino IDE.
I've just been informed the board got an upgrade of sorts with a "Blue Pill 2" board featuring either STM32F401CCU6 or STM32F411CEU6 Arm Cortex-M4F microcontroller, and a USB Type-C port for power and programming. It's black, so instead, I'll call Black Bill as some others appear to do.
Specifications for the Blue Pill & Black Pill boards (new features in bold):
- MCU (one of the other)
- STMicro STM32F103C8T6 ARM Cortex-M3 MCU @ 72 MHz with