Detecting different notes /(sound)

Steve2381

Senior Member
Hi all

I have been asked to design a sound controller that will illuminate 10 leds in a VU meter style, but based on the actual note played.
Is this possible with a Picaxe? I have Googled around and not found much.

The idea would it listens to a repetitive set of tones (say from a keyboard) and then determine the note played (lets say it allocates a number to the note it hears).

It would not have to be super accurate. More of a higher or lower than the previous tone would probably be a good start.

This sounds like a job for filters or something. Out of my league I think

Thanks
 

geoff07

Senior Member
There is another recent tread asking a similar question: http://www.picaxeforum.co.uk/showthread.php?27002-Musical-Note-Detection-Possibilities

My view is that you do indeed want filters, one tuned to each note of interest. The picaxe would then detect the output from any circuit that was currently active, and light the leds. A Picaxe does not have enough speed to determine the signal frequency, but can readily light the leds and perform any control function. The filters can be simple passive units or complex integrated chips, according to your need.
 

Steve2381

Senior Member
Thanks for the assistance guys.
Nice circuit that nekomatic! I will have a play around and see where it leads
 
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