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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
I don't think so unless you can drop the voltage with a diode. LiFePo4 batteries are in the right voltage range though.
You could always run from the mains, and should be able to connect the USB-TTL converter (just not with the 3.3v supply connected). The only reason I'm less happy about suggesting that is you want to be really careful you don't touch the mains connection.