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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.
@Ollie
Hi, typically you'd have a ground, power and a data pin on a module like that. It's the data pin you will send on. I'd guess pin 2 in your pic - making the unnumbered pin, power. For espruino it would be 3.3v power, arduino is 5v. Maybe confirm it is good at 3.3v, I would imagine it is but do not know.