I'm trying to detect when speaker starts playing audio, my speaker is connected with a 10uF 50v in series with the positive (red) cable coming out of my receiver, and negative to ground.
Speaker (+) ----- || ----- A0 Speaker (-) -------------- GND
I was reading values from around 200 I believe. I had something like input > 210 and it worked(to detect audio). Now at some point and I'm sorry to say I have no clue what changed the reading changed to 100, it looked weird but at that moment I didn't care much and changed my control value to 110.
Now this happened again and I'm reading 36. I'm kinda worried now I'm doing something horribly wrong. Any ideas?