The "Blue Pill" is a cheap STM32 Cortex-M3 based microcontroller board. It is popular because of its price and versatility. Now there is an updated variant, dubbed the "Black Pill" with a new STM32 microcontroller based on the Cortex-M4F (with a FPU).

The Blue Pill uses the STMicro STM32F103C8T6 and costs less than $2. The new "Black Pill" is shipping in two variants, one using the STM32F401CCU6, the other using STM32F411CEU6. Both are Arm Cortex-M4F based microcontrollers.

Black Pill: https://geni.us/Uq3QXi
FT232RL FTDI USB to Serial Converter: https://geni.us/Au5r
ST-Link V2: https://geni.us/zqko2u
STM32 Flash loader: https://www.st.com/en/development-too...
Mbed OS: https://www.mbed.com/en/
NUCLEO-F411RE: https://os.mbed.com/platforms/ST-Nucl...

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