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It’s this microcontroller board: http://wiki.stm32duino.com/index.php?title=Blue_Pill http://wiki.stm32duino.com/index.php?title=Blue_Pill They are dirt cheap

by TomVDB 8y ago

It’s this microcontroller board: http://wiki.stm32duino.com/index.php?title=Blue_Pill http://wiki.stm32duino.com/index.php?title=Blue_Pill They are dirt cheap and can be found for around $2 on sites like AliExpress etc.