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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.
@Gordon
Sadly yes, at the moment (on the Pico). The original Espruino board is much more accurate for some reason, and the rev 1v4 has a crystal on board anyway.
It's something that's been on my list to change, because if done right a firmware update should basically fix it.