SCHEMATICS:

well right now Iam posting only measurement unit, voltage and current. For resistance you can use the same one as voltage. anyways here are the links

Well that is for measurement part, for recognising the commands as you must have read above we are using this EasyVR module.  Check its manual for training part, and as there isnt a library available for it for AVR we have made it available on our blog. 

http://skinnysatan.wordpress.com/2014/05/04/speech...

Train the module, interface it with your uart and boom you are ready with speech recognition