Wow, check out this cool audio spectrum analyzer you can make using an Atmel AVR MCU! Well, I’ve always wanted to make one of these but finally found it at HackedGadgets!
This is an experimental work to monitor a spectrum pattern in radio band, and is a continuous project from Audio Spectrum Monitor. To analyze the spectrum of an input signal, I chose an Atmel AVR microcontroller that used in the Audio Spectrum Monitor to process FFT. When think it easy, it can be thought that sample an input RF signal directly and analyze it will do. However, you will able to recoginize that there are some techinical difficulties from following reasons.