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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.
@MaBe
Oh yes, power is important ....
You can use a USB powerbank, if mobile, or a USB power supply.
USB 5V to NP 5V DC Power and USB GND to NP GND
USB GND to Puck.JS GND
Puck.JS PinXX to NP Data Input
like in this example by Gordon http://www.espruino.com/WS2811