I'm actually working on something like this.
It's currently a work in progress... It's a typical 9G servo modded so that it can do multiple turns, revolution and limit detection via the wires, a H bridge (actually the one from the servo, just removed the chip and soldered some wires) and a radio module so it can be integrated in my home automation system.
All held together on a 3d printed skeleton. When it's final, it should look way better and have 3 AA or AAA batteries.
I only need 5 for my apartment and the parts are basically free for me (except the servos and my time).
