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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.
@user7114
It has 3.3 VDC TTL serial and OTG USB. Perfect for your upcoming low cost Espruino/Espruini.
Note: The product doesn't ship until November and has export controls on it.