Connecting audio (line or phones out) to Arduino A0 - need help please! - Audio - Arduino Forum

Hi everyone, I'm stuck and I need help! What do I need to get the audio signal to Arduino for FFT processing? Is there a simple solution? I would like to build audio spectrum analyzer based on Arduino Nano and MAX7219 FC16 dot matrix display module. I use the code from this video and here is the code. The code is kind of working (I had to add "#define USE_FC16_HW 1" to the library to make it work with my display module), but I have problems getting the signal in with the right voltage (or at l

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