firmata-electron/examples/servosweep.js

A library to control an arduino running firmata

/**
 * Sample script to move a servo back and forth.
 */
var Board = require("../lib/firmata").Board;
var board = new Board("/dev/tty.usbmodemfa131", function() {
  var degrees = 10;
  var incrementer = 10;
  board.pinMode(9, board.MODES.SERVO);
  board.servoWrite(9, 0);
  setInterval(function() {
    if (degrees >= 180 || degrees === 0) {
      incrementer *= -1;
    }
    degrees += incrementer;
    board.servoWrite(9, degrees);
  }, 500);
});