"use strict"; var Cylon = require("cylon"); Cylon .robot() .connection("rapiro", { adaptor: "rapiro", port: "/dev/ttyUSB0" }) .device("rapiro", { driver: "rapiro" }) .on("ready", function(bot) { var on = false; setInterval(function() { if (on) { console.log("on"); bot.rapiro.led(255, 0, 0); on = false; } else { console.log("off"); bot.rapiro.led(0, 0, 0); on = true; } }, 1000); }); Cylon.start();