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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
That's looking great! How are you soldering it - with a hotplate, or air?
I use the TP4056 on stuff here and it works well - I've never seen a reason to change it. I guess something that would support different voltage ranges (eg to allow you to charge off a solar panel safely/reliably) might be cool though.