Came across this review of The Blue Pill... challenging some Arduino board(s).
It looks like the same mc as Espruino Original board, just much less Flash (64 instead of 256 Kb) and RAM (20 instead of 48 Kb).
Board quality is though not comparable at all... nor the ease of development: even though a USB socket is on the board, it is just for powering... Programming still has to happen the old fashion way via SWD - Serial Wire Debug with adaptor USB-to-Serial.
The little Flash and RAM does not allow to have the USB code resident...
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