I have a great view of the hummingbirds I feed. what I would like to do is to get a way to sense their presence.
I can easily hear their hum so the pressure wave is there to use.
The feeder is outside, under the awning so it is out of the rain. I could easily mount it above the feeder and have it 'look' down.
I am hoping to get a count of how often there is a hummer in the area. not looking for rocket surgery accuracy, just an ides if there is one there every 5 minutes or maybe every 10....
any suggestions on sensors ?