I have scoured the community and have yet to see this idea discussed.
We have a small dog (15 lbs) who we have trained to go to the back door when she wants to do her business. Since we have a busy household, and there were times she sat there for 10 minutes or more before anyone noticed, I put a motion sensor near the floor that triggers our whole house audio to tell us that the dog needs to go out. Simple enough, and effective…for the most part.
The problem, of course, is that human beings walk by that same back door from time-to-time and trigger the ankle-level motion detector. Which then falsely triggers the voice message to let the dog out. In a sense, I’m trying to create the inverse of a pet-immune motion detector; I want a human-immune motion detector!
So, what are my options for triggering based on presence of a small dog?
Get a second motion detector. Place it at “human height”, block off this detector’s downward vision, and then write a piston that looks for situations when the low motion sensor is activated while concurrently the high motion sensor isn’t activated. That’s probably workable, but ST makes me nervous when you have to play with timing.
Use a pressure mat (discussed elsewhere in the community). Problem is, my dog is not that accurate with where she sits.
Just get a doggy-door. This would obviate the need altogether, but there are other reasons we can’t go this route in our house
Very curious to get reactions and ideas from the community on this.