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STM32F103C8T6 - Blue Pill Development Board
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STM32F103C8T6 ARM CCortex-M3 STM32 Minimum System Board - Blue - Free
STM32F103 «Blue Pill» modified board - EasyEDA
STM32F103C8T6 - Blue Pill Development Board
Programming STM32F103 Blue Pill using USB Bootloader and PlatformIO