For a while now, I have been trying to figure out how to detect when the wife is at home, or 'on the road'. I needed something that was fairly accurate, and inexpensive as I was planning on triggering home automation functions based on this 'occupancy' status. For various reasons, I could not rely on the car occupancy detection method, and other solutions were too costly or not accurate enough. The solution? Detect when my wife is home by looking for the presence of her keys on the keychain storage hook located in our kitchen. She will never leave the house without her keys, so this was the best methodology to use as an occupancy sensor. Most people always have their keys on them, and usually place them in the same location when at home.
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