Audio connections to Arduino

Hey,

So im trying to build a project that involves audio feedback from a microphone, however, i have a couple problems i need some help with.

  1. i have looked everywhere, and I'm trying to find something that will take a 3.5mm audio cable and connect it to an arduino. basically im trying to find an adaptor thats similar a 3.5mm to RCA cable, however, to wires instead.

  2. Is there like an arduino accessory that i can get that has like a breadboard that i can connect to the arduino?

  3. are there any good FFT (fast fourier transform) libraries that i can use. ive tried to find a few, and all of them gave me issues.

Thanks so much for you help in advance.
Fizzul

Search for "arduino audio shield". There are lots out there.

and

If you want 3.5 mm jack to wires, all you have to do is take an old pair of headphones or something else you don't want anymore, cut the wire to the size you want, and strip the wired.

So im trying to build a project that involves audio feedback from a microphone,

Signal from mic is too weak for arduino, likely you will need a pre-amp.

FFT you could find here, though not as a library, probably you could wrap it in class etc.. http://coolarduino.wordpress.com/2012/03/24/radix-4-fft-integer-math/