I'm new to this Arduino DSP stuff, but I've read articles on how to make a music visualizer from various sites.
I've decided to route audio output from phone's 3.5mm left channel to arduino analog a0(Free running. ADCH 0-255). But, when i serial plot the values I get, it seems that there is no audio received, and the values just oscillate from 0-255 no matter which song I play, even when I play no song. I knew I had to amplify the audio before sending to analog in, but I decided just to watch how small is the signal so I sent to analog IN directly.
No, I don't have an oscilloscope yet.
and yes I have a mic, but I felt routing audio from phone directly to arduino would make life simple.
PS: there is so much noise, when I connect A0 to breadboard. Ive tried several serial capacitor combinations but output is just 0-255 oscillations like a sine wave.
Help me out,
Thanks,
NK.
xD