I'm attempting to build a audio spectrum analyzer (using addressable RGB LEDs). I'm probably OK at the programming side and hopefully doing the FFTs on the arduino but it's the electronics I'm new to.
The hard part is looking like getting audio in from a microphone.
I started out trying to follow the Instructable at http://www.instructables.com/id/Arduino-Audio-Input/
but it uses two 9v batteries as power, and I'd like to use the standard 5v power. (This could be from an external power regulator - not the ardunio - so I can power enough LEDs).
This - http://proto-pic.co.uk/breakout-board-for-electret-microphone/
- component would probably be ideal but it has a fixed 100x gain, whereas I'd like an adjustable gain, as the comment on that page explains.
Finally I found this - http://learning-arduino.tumblr.com/post/12046833573/automatic-beat-detector
. Does that look like it would do what I need? I'm wary because (s)he says "Overall, I’m not satisfied with the result" but it's all I've been able to find.
I'm starting to think I might have bitten a bit too much off for my first arduinio project!