http://coolarduino.wordpress.com/2013/01/09/audio-vu-meter/
May be too complex, graphic LCD and math, if you are novice. I've seen a shield for arduino, that does same things in hardware - rectifier, can't find a link.
http://coolarduino.wordpress.com/2013/01/09/audio-vu-meter/
May be too complex, graphic LCD and math, if you are novice. I've seen a shield for arduino, that does same things in hardware - rectifier, can't find a link.