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Many years ago, 2006, I was using the sudden-drop detection in my iBook G4 to know when people were walking down the hallway to my office.


Please provide more details on how you accomplished this, it sounds interesting.


Wouldn't you get false positives every time you typed?


Yes, but due to how the structure was (poorly? likely…) constructed, the movement caused by someone walking down the hall was much larger than me typing.




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