TLDR:
I want to get a Signal from the speaker output of an Amplifier into an ESP32 to process it for a VU meter and visualization stuff. How? What About the high level?
Long Version:
I bought an 100 Watt Bluetooth amplifier (Fosi Audio ZK-1002T) and I want to tap into the Audio-Chain at some point to get a mono or optional stereo signal from the audio to process it for visualization in an LED Lamp I built. The Amp has line and bluetooth inputs and no headphone outputs, only high level speaker outputs.
Of course the easy way would be to just split the line input of the amplifier and get that into the ESP32. I saw some tutorials on line input to Arduino. Seems to be no big problem.
But then I would totally miss every signal that gets over the bluetooth into the amp. I would love a way to get a signal no matter what input I choose.
Most logical to me would be the speaker output.
Problem there is speaker outputs are high level and probably up to 100 watts (hence the 100 watt amplifier) but I am no expert in audio signal processing. My guess is the ESP32 would just start to smoke if I input the signal right away.
Do you have an idea what I can do to get the signal into the ESP32? Or if I miss another way to tap into the audio stream before the speaker output? Maybe I can grab a signal somewhere on the Amplifier.
Thanks in advance.
PS: Further question. Does anybody know how a speaker signal behaves if you just split the output? Does it lose power? Will the speaker be less loud? Sorry again - no expert in audio electronics.