by codebender_cc @ instructables.com:
In this tutorial you will learn how to use a voice recognition – serial – module with the Arduino uno board. This module can store up to 15 voice commands. Those are divided into 3 groups, with 5 commands in each group.
First we should train the module with voice instructions group by group. After that, we should import one group before it could recognize the 5 voice instructions within that group.If we need to implement instructions in other groups, we should import the group first. Only one group can be active per time.
In this tutorial we will use an RGB LED and we will try to change the color of it with voice commands.
How to use a Serial Voice Recognition Module – [Link]