Is there a way to get the espruino to cut power to them without a relay
Disconnecting the Neopixels' VCC pin from power is the only option I'm afraid - it can't be done in software.
@Gordon started
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.
Disconnecting the Neopixels' VCC pin from power is the only option I'm afraid - it can't be done in software.