looking for a way to measure just how open or closed a window or curtain or door or draw is .... one way might be to adapt a retractable pull-cord device - the sort of thing used for badges & passes ... eg:
one with a centre that rotates as the cord is pulled or released would be good - have Googled, but none of the dozens available seem to have this feature ...
had hoped there'd be a small tape-measure device with digital read-out (stretch the tape, read it later - more accurate than laser, easier than trying to read the markings on the tape) which could tap into, but no such thing seems to exist ... so having a rotating centre seemed the next-best thing (could maybe add some marks & read them with a photo-cell & count the pulses) ...
the approach might work in many situations, but maybe there's a better way ??
one with a centre that rotates as the cord is pulled or released would be good - have Googled, but none of the dozens available seem to have this feature ...
had hoped there'd be a small tape-measure device with digital read-out (stretch the tape, read it later - more accurate than laser, easier than trying to read the markings on the tape) which could tap into, but no such thing seems to exist ... so having a rotating centre seemed the next-best thing (could maybe add some marks & read them with a photo-cell & count the pulses) ...
the approach might work in many situations, but maybe there's a better way ??
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