To control the Sky you can use a IR remote or a BT-device. The Arduino is able to connect with a HC-05 (3$ device) or get IR pulses (2$ with remote). What you need is an app to comunicate with the Arduino and send the commands like a serial device.
I wrote an app for Windows 10 devices. It works on you PC and on your mobile phone!
Download the app from the Windows Store:
- Currently you can connect to the sky and set the animations: day/rainbow, night and rain.