voice control home appliances using pic and sensor

My teacher assign me a project on "voice control home appliances using micro-controller and sensor" and now i don't know which sensor should i used that detect human commands like light and controlling fan speed through human commands in Proteus and coding in mikroc. please help me.

Something like this ?
https://www.bing.com/videos/search?q=Voice+Recognition+arduino&view=detail&mid=49EC79BA13821958F0F749EC79BA13821958F0F7&FORM=VIRE