Please help me to find the working circuit, sketch, and libraries to get music audio from an ordinary player via 3.5 jack into Arduino (Nano), split it into up to 8 bands, depending on music frequencies and store band volume values in an array for later use. I had spent several days trying to find something working but was completely unlucky ((
I'm an advanced coder but completely newbie in electronics and FFT and don't even expect to understand them. I need a working sample/example as simple as it possible: wire schema, copy-paste code to IDE, compile it to the board and, for example, see debug print in the serial monitor which is synchronous showing high values on the loud sounds and low ones during silence for every of 8 spectrum bands separately.
I will be very grateful for any proper guides/links.