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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
So you're using the Espruino board? Does it have the latest firmware on it?
You shouldn't actually need batteries - if you're plugged in via USB then the board will provide up to an amp from the USB's power.
Last thing I guess is did you use the right end? The lights should be marked with DI and DO on the PCB inside the light itself - you need DI. Sometimes it's pretty hard to see which is which.