I built this door opener using Makeblock, Easy VR (Voice Recognition) and a few feet of elastic.
At first it was controlled by the IR Remote, then I modified it to respond to my voice : )
The pictures and video link below should give you a pretty good idea how to make it:
If you already have Makeblock then you just need the EasyVR Shield to make this (or any Voice Recognition Project) work. My code and an affiliated EasyVR link are below. I would recommend using my code as a template, as the EasyVR code kept getting cut off by the “baseshield::begin” code, so I had to hack it to pieces and remove the part that was interfering with EasyVR.
Hope you like it,
-Ray
EASYVR SHIELD (my affiliated link)