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Sensors / Detectors: Motion Sensors
Last Updated on:
Wednesday, April 23, 2008 09:06 PM |
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Sensors / Detectors -- Main Page |
| Circuits Designed by Dave Johnson, P.E. : |
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- Home Made Geophone Detects Foot Stomp
A home made geophone is made from a strong magnet, a coil of wire and a rubber band. The circuit is sensitive enough to detect the vibrations of a nearby foot stomp. It could be used as an
earthquake detector. (added 7/06)
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- Human Traffic Footstep Alarm
This circuit processes the amplified signals from the footstep detector circuit and activates a microprocessor when the circuit detects footsteps. At has an adjustable sensitivity.
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- Human Traffic Footstep Detector
This circuit uses a surplus geophone to detect human footsteps from 100 feet away. It was designed for monitoring the Mexico/USA border. This preamp part of the system draws about 50
microamps from a 12 volt supply.
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- Pigeon Scarecrow
I have an area on my roof where a large flock of pigeons like to roost. Their nesting materials and droppings really make a mess. Often there is enough junk from them that it clogs my roof
gutters. Perhaps one way to scare them away is with a device mounted on the roof near their favorite roosting spot. The device....
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