monitor_mic/pa_mic.sh

#!/bin/bash
#from https://unix.stackexchange.com/questions/685390/detecting-sound-silence-on-a-sox-pipe


# Get your PulseAudio source monitor (edit regex to suit you)
pulse_monitor=$(pactl list short sources | awk '$1 = /alsa.*monitor/ {print $2}')

function wait_for_audio() {
  parec --rate 1000 -d $pulse_monitor 2>/dev/null \
  | LC_ALL=C fgrep -qm 1 .
}

while [ true ]; do
  wait_for_audio
  echo "Sound Detected starting @ $(date)" >> $log
  sleep 2
  exit
done