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A long-neglected project on my to-do list is to do exactly the opposite with one of these. I want to use the circuit board to detect movement in front of it and use the motor output to close a relay instead of squirting smelly stuff. The relay would then trigger a button push on my wireless doorbell button and ring the doorbell if it detected movement.

I really should get back on that.

This would be much simpler with just an ESP instead of messing around with the air freshner mechanism, it'll be more trouble than its worth.

Well now I have to do it, don't I? :P

Me too. I used the existing board and connected myself directly to the transistor.

Used http://toit.io to connect the ESP32 to the cloud so I could control it from my phone (with a tiny Flutter app).

Same here, I found this article because I was looking for a time mod so it would spray less often than it does out-of-the-box. And now I'm convinced I should not be spraying any questionable chemical perfume in my house anyway.