Hello,
Thanks for the good tipps. I set the internal reference to " analogReference(INTERNAL);". Now i get greater readings but the only values really measurable are between -15db to 0db output level of my audiointerface (with white noise, Inteface is an Mbox). Below that there is not really a difference. Thats way to less detection accuracy. Especially when it comes to something spoken. Or big long Fade's in Music.
Plus: I get a lot of zero or very low values in between (or better said: rows of them, like: 75,64, 23, 9, 0, 0, 12, 23, 64, 75).
What am i doing wrong? Should i remove the cap+resistor to ground?
thanks
greetings
Stephan
PS: If someone has a completely different idea of doing this (with a external ADC Chip or whatever) just let me also know! i am open to every idea. i just want to solve the problem and learn something. thx.
and: maybe the offset circuit is needed because Audio Signals are always AC (hope i'm right there) signals (and they go from some - V to some + V) and the ADC expected only postiv signals. As he is getting postive and negative he may cut of the half of the real audio signal (which would explain the very low rows of readings in between). Is there some logic in this thought?