Blue Pill
The Blue Pill is a popular Core Board containing an STM32F103C8T6 or equivalent MCU.
The board is believed to have originated from VCC-GND. However, there are many sellers around selling various variants
Standard Blue Pill
The most common variants are one with a Micro USB connector with 4 mounting tabs, and a variant with a Micro USB connector with 2 mounting tabs. For mechanical stability, the variant with 4 mounting tabs is recommended.
Recently another variant with a USB-C connector has been observed.
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For mechanical stability it is recommended to solder the mounting tabs to the board.
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Boards sold before 2019 are likely to have an incorrect value for resistor R10. The correct value is 1k5.
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Blue Pill Plus
The Blue Pill Plus is a variant made by WeAct.
Be aware of a variation in pinout, where on the original Blue Pill, there is a GND and on the Blue Pill Plus it is a 5V. It is recommended to leave this pin disconnected so both variants will work.
Most notable differences are the Blue Pill Plus got rid of the jumpers, and uses a boot button in stead. Furthermore, the Micro USB connector has been replaced with a USB Type C connector.
WeAct sells the following variants:
TODO
RobotDyn STM32 MINI
Product page: https://robotdyn.com/stm32-arm-arduino-mini-system-dev-board-blue-pill-with-arduino-bootloader.html
The RobotDyn STM32 MINI seems to be no longer in production.
