qrar

You can use this package to decode any QR codes spotted by your Parrot AR.Drone's camera.

Prerequisites

The QR code module used requires Cairo and FFmpeg; I used Homebrew to install both of these on Mac OS X:

brew install cairo ffmpeg

Example

This program outputs all of the decoded QR codes to the console:

var QRAR = require('qrar');
var drone = require('ar-drone');
 
var codes = new QRAR(drone);
 
codes.on('qrcode', function (code) {
  console.log(code);
});
 
codes.start();

This program starts an ar-drone REPL:

var arDrone = require('ar-drone');
arDrone.createClient().createRepl();

So if you pipe the output of the first program (decode.js) to the second (repl.js):

node decode.js | node repl.js

Then you can show QR codes like these to your drone and it will obey!

takeoff()

land()

See felixge/node-ar-drone for the available commands. There are lots of free QR code generators online and apps that work from a smartphone (in fact you can just tweak the above image URLs to get started).