I'm not sure you need a resistor? Espruino should run off 5v without needing anything in-line?
@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.
I'm not sure you need a resistor? Espruino should run off 5v without needing anything in-line?