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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
Chances are it's this one: https://www.adafruit.com/product/1334
I think the LED just comes on when you add power to it (or maybe you have to with the 'light' pin up - either way it doesn't need I2C)