I’m looking for either a ready-made sensor to do this or ideas how to roll my own way to detect air flow.
I want to detect air flow from a heating vent in a home. I understand I could technically connect to the furnace’s fan but that’s not really an option. I need a non-intrusive way to do this.
When the thermostat signals the furnace “hey, it’s too cold in here”, the furnace fires up and after a short delay the fan kicks in and blows warm air. It’s the moment (+/- a few seconds) when the air starts moving in the room I want this sensor to send a signal to my Panda II.
I don’t need to know how much air is flowing, only that air IS flowing. Parallax has a motion sensor that when triggered sends a high signal to the micro-controller. I’m looking for something similar except for air flow.