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Sensors / Detectors: Motion Sensors
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Sensors / Detectors -- Main Page
Last Updated on: Wednesday, July 16, 2014 06:35 AM

Circuits Designed by Dave Johnson, P.E. :

  • 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.
  • 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. 

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
A Good IR Detector -  Some of the companies put two transmitters, one on each side of the detector, to get a good field of coverage for the front of the 'bot and to detect left and right. 'Robots, Inspiration to Implementation has a great schematic that you can use to build one of these. I used all Radio Shack parts for the one I made and it cost about $10 to build.  This detector will NOT detect black flower pots nor the bottom of boots (grin)....(electronic circuit added 4/05)
Direction sensing motion detector -  Detects motion and indicates the direction that a human or animal is moving (left or right).   12 pages.  This project is not available as a kit of parts. [free schematic from Golab.com]
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. The system can detect human and animal motion by the electric fields they disturb. .
Electric Field Disturbance Monitor-2 -  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. (this link is off-site) . [Designed by David A. Johnson]
Everything-that-moves ALARM -  A crucial failing of proximity detectors is their unreliable and tricky nature.  This is where they are used to detect humans, not to speak of smaller living beings. One common approach is to detect eddy currents in a living body, which are induced in the body through a.c. mains wiring. However, such circuits become altogether unusable....(design added 08/08/08) [Site is under construction right now]
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) . [Designed by David A. Johnson]
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. . [Designed by David A. Johnson]
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. . [Designed by David A. Johnson]
Infrared Detector (Soylis Papanastasiou) -  The circuit of manufacture appears in form. sensory is a passage of silicon with relatively big surface.  This passage when it is not litted up by infra red light has very big resistance of order of Mohm. this resistance is reversely proportional at approach of brightness. The type of passage is not critical, in the place can enter anyone. The resistance of passage....(electronic design added 09/08)
Infrared Detector (Tomi Engdahl) -  This circuit is a simple IR detector for testing IR remote controllers. The circuit is based on one phototransistor which receives the IR beam. The NPN transistor works as an amplifier which feeds current to the led. When this circuit detects IR or light, the LED is on. So you need to shield the phototransistor from ambient light if you don't want to do your tests in the dark. The best way....(circuit / schematic added 2/03)
Infrared gate 2 (Peter Jakab) -  This is an infrared gate with two sensors planned to use in the wall in the way behind a door. It can be applied in a toilet to keep track of that someone is inside exceeding a certain amount of time. After that time elapsed, the circuit triggers the digital output wich can turn on a ventillator. The time period.... [Peter Jakab, Electrical Engineer, Engineer of Informatics]
IR Detector (John Schuch) -  This circuit converts infrared light into sound. Modulated IR light, like that from remote controls, IR received by the phototransistor and is amplified by the LM386 IC  (electronic circuit added 4/05)
IR Detector/Emitter -  (electronic circuit added 4/05)

Sensors / Detectors: Motion Sensors
#'s - I      J - Z
Sensors / Detectors -- Main Page

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