> You can't just key off of "loud noise" and I don't know how hard setting up to listen to specific frequencies for alerting is. Fast fourier transform on the

> You can't just key off of "loud noise" and I don't know how hard setting up to listen to specific frequencies for alerting is. Fast fourier transform on the audio would give you volume for each frequency range. That probably requires some DIY hardware & programming. But a power metering plug would be a cheap off-the-shelf solution. Find the ones pre-flashed with ESPhome for ~$15-20, find thresholds for ON/OFF with a bit of trial and error, and you're done.