Hi there,
This weekend I’ve reviewed the sampling procedure used in the spectrum analyser and increased the sampling frequency, by moving it from interrupt procedure into the main loop. Furthermore I added some display modes of analyser spectrum. Display mode can be changed by pressing PD2 / INT0. Button is a shortcut to GND. On Pong Board it is the coin insertion “switch”.
Download AVR 4 Studio / WinAVR files from here