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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@MaBe
Yep
and there is a c implementation as well https://github.com/ricmoo/QRCode
I am petty sure this should be created as JS module with at least a size a 64x64 one bit which is pretty nice readable on oled's and lcd's.