Hi everyone, I am trying to build a simple sound meter that takes a microphone input and based on the ambient sound level turns on some LEDs (when its louder, more lights come on…). I am using a CUI CMA-6542PF omnidirectional microphone (cut sheet attached) and set up the measurement circuit included on the cut sheet, but when I monitor the serial input in Arduino I am getting confusing results. The serial data seems to be slightly different every time I upload the project, and it does not change in response to sound (I have been playing music out of my phone directly over the mic to test this). Has anyone worked with this microphone before and know how to get some useful reading from it?
cma-6542pf.pdf (289 KB)