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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
It's just 3.3v you need - but when the display is on it can draw about 60mA or so, so you need to ensure whatever programmer you're using can supply that.
It's also possible to keep the battery connected and to just connect GND, SWD, SWCLK and not worry about VCC at all.