Raspberry Pi and pi-blaster , Change PWM -sample??-

index.js

var http = require('http');  
var url = require('url');  
var piblaster = require('pi-blaster.js');

http.createServer(function (req, res) {

  res.writeHead(200, {'Content-Type': 'text/html'});
  var brightness = url.parse(req.url).pathname.slice(1);

  if (brightness.length === 0 || isNaN(brightness)) {
    res.end('hello? yes, this is pi!');
  } else {
    piblaster.setPwm(17, brightness / 100); // <- change PWM LED and Moter speed control
    res.end('Brightness set to: ' + brightness + '%');
  }

}).listen(1337);