Hi,
I am a Mechatronics and Control Engineer, you can check my work on my blog [login to view URL] , I have done many such projects so I can quite easily complete this one.
I will use Arduino UNO for the programming purposes and for the wifi connection, I have two options, one is Arduino Wifi shield and the second one is Zigbee Wifi Module. I can work on both of them, which one you like and I can complete it within 10 - 15 days quite easily.
I will design a complete prototype here as you mentioned and will show you the output via video or directly through skype video session which one you like.
Thanks.