Circuit - Sensors / Detectors: Motion Sensors Electronic Circuits Designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 22, 2012 07:42 AM

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Sensors / Detectors: Motion Sensors Circuits

ELECTRIC FIELD DISTURBANCE MONITOR
This schematic is the power supply and front-end sections of the field monitor that is discussed in more detail at Electric Field Disturbance Monitor. (this link is off-site) The system can detect human and animal motion by the electric fields they disturb.

ELECTRIC FIELD DISTURBANCE MONITOR
This schematic is the motion discriminator alarm and battery monitor sections of the field monitor that is discussed in more detail a Electric Field Disturbance Monitor.

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)

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.

Motion Alarm Using Piezoelectric Device
An inexpensive piezoelectric device is used as a motion sensing device for this motion alarm.

Piezoelectric Vibration Sensor Activates Switch
An inexpensive piezoelectric wafer is used to detect vibration and when the vibration is sufficient a switch is activated.

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....

Shadow Activate Motion Detector
This circuit can sound an alarm when the shadow of a hand or arm moves over two small photo diodes.

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