DC Offset at Analog Input A0

[jremington]

This forum thread has some useful advice:

How to read data from audio jack?

I am planning make a sound reactive LED controller with Arduino Nano which reads audio signal from any audio jack (probably 3.5mm), e.g. computer line-out, music players. The louder the music, the brighter the LEDs. I had tried to use a microphone module to read the sound level before, but the result was not what I expected. The performance is unstable since it depends on the distance between the microphone and the speakers. Therefore, I think reading the audio signal directly from the audio j…