I bought this off ebay:
I want to detect spikes, someone knocking on the door.
I found it impossible to set the sensitivity.
I connected it to A2 and I read the values in a loop.
It jumps from almost zero to 1023 in a fraction of a turn.
And even when I manage to set it just right, I am missing some spikes.
Please advise, I’m new to this.
Is there a smarter way than polling the pin in a tight loop ?
Is this mic assembly faulty or just crappy, or am I missing something ?