bluehybrid @ instructables.com shows us how to use your voice to control a led light on Arduino. To achieve this he used the 1Sheeld Arduino shield.
This Project is getting start to use arduino with 1Sheeld
In this project we will turn an LED (ON) and turn it (OFF) by Voice
We will say “Open” to turn it (ON) and “Close” to turn it (OFF)
Controlling Arduino using your Voice – [Link]