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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.
@rmd6502
I have a few HP QDSP-6064 bubble displays, and it looks like they'd fit perfectly over a bare MDBT42Q module. A 3-layer sandwich of coin cell, module, display would fit in a cocktail ring sized 3d printed enclosure.
As a stretch goal, I'll mount an AS5601 orthogonally and build a "digital crown" (copyright Apple of course)