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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've found it's a bit touch and go with the voltages - it depends on the type of pixel. Generally you can connect neopixels straight to a normal USB Espruino board because there's a diode from USB volts. That drops the voltage by 0.7v or so to 4.3v, which means they're fine off of 3.3v data.
However sometimes if you plug them into a USB wall supply, they often give out 5.5v which means the pixels get 4.8v - which is then too much for reliable data :)