Hi,
Hope the OP is ok!
One morning I went out to the garage to find that I had left the garage door open ALL NIGHT! Luckily a quick look showed that everything was still there, lawn mower, tools, etc.
Once I got into electronics, I made a garage door monitor. Not only does it beep when the door opens or closes, it will beep every 3 minutes if the door is left open for longer than 5 minutes.
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Thanks,
Alan
Can you retrofit one for a toilet seat? Those would sell like hot cakes.