Thoughts on an Arduino / Baofeng Experiment

Thinking about how to detect a signal and how to distinguish it from static / noise .  

Luckily , we have A and D inputs on the Arduino. 

I'll have to keep my eyes open at Hamfest for some of these small parts . 

I'll try to write some rough code after Hamfest.  I've got a couple plain Arduinos and an Esplora with an on-board mic.