A simple of how to control an Arduino running firmata with Node.js

motor_run.js

var firmata = require('firmata');
var board = new firmata.Board('/dev/cu.usbserial-A600491U',function(){
    console.log('Connected to Arduino');
    console.log('Firmware: ' + board.firmware.name + 
                '-' + board.firmware.version.major + 
                '.' + board.firmware.version.minor);
    console.log('Enabling motor 1');
    board.pinMode(4, board.MODES.OUTPUT);
    setInterval(function(){
      board.digitalWrite(4, board.HIGH);
      board.analogWrite(5, 255);
    },5)
});