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A lot of fairly cheap robotic sensors, IR, Ultra sound, Visible light can detect objects up to 3 meters away fairly consistently.
"Specification:The SRF005 ultrasonic range sensor detects objects in it’s path and can be used tocalculate the range to the object. It is sensitive enough to detect a 3cm diameterbroom handle at a distance of over 3m."
A 5 foot bit of string tied to source will also work.
A bright small source of light can be monitored by 2 light detectors set in long tubes set at a slight angle to each other.. They will only both see the light when at a set distance from the source.
If a radio transmitter sends out a signal that is then sent back you caould calculate the distance by the time difference between the 2 signals
None of this is as good as buying a baby watcher - these use a radio signal - this would be too complicated to make at home.
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Posted:Sep 14, 2010
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