"use strict"; var Cylon = require("cylon"); Cylon .robot() .connection("raspi", { adaptor: "raspi", port: "/dev/ttyACM0" }) .device("servo", { driver: "servo", pin: 11, limits: { bottom: 20, top: 160 } }) .on("ready", function(bot) { var angle = 30, increment = 40; setInterval(function() { angle += increment; bot.servo.angle(angle); console.log("Current Angle: " + (bot.servo.currentAngle())); if ((angle === 30) || (angle === 150)) { increment = -increment; } }, 1000); }); Cylon.start();