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Earthquake Alarm Circuit - Geophones are dandy motion sensors. They are metal cans containing a powerful magnet, suspended with springs inside a coil of wire. The magnet functions as a floating mass. The slightest vertical motion of the device causes the coil to move relative to . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2005
Electric Field Disturbance Monitor-Alarm Discriminator + Battery Monitor - This schematic is the alarm discriminator plus the batterry monitor of my "Electric Field Disturbance Monitor". The system can detect human and animal motion by the electric fields they disturb. . . Circuit by Dave Johnson P.E.-March, 2002
Electric Field Disturbance Monitor-Front End + Power Supply Circuit - This schematic is the power supply and front-end sections of my field monitor, "Electric Field Disturbance Monitor". The system can detect human and animal motion by the electric fields they disturb. . . Circuit by David A. Johnson P.E.-March, 2002
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 __ Designed by © Rev. Thomas Scarborough
Footstep Alarm for Human Traffic - 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 . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006
Front End + Power Supply Circuits of the Electric Filed Disturbance Monitor - This schematic is the power supply and front-end sections of my field monitor, "Electric Field Disturbance Monitor". The system can detect human and animal motion by the electric fields they disturb . . . Hobby Circuit designed by David Johnson P.E.-March, 2002
Good IR Detector - How to build a simple IR detector, schematics and alternate links __ Designed by DC Reagan
Hand Wave Motion Detector - The circuit below works quite well in typical indoor room lighting. I would not recommend its use in direct sunlight. Two small PIN photodiodes positioned about one inch apart form a shadow detector. With no shadow cast on the devices, both devices produce nearly identical current levelsCircuit Solution by Dave Johnson P.E.-August, 2005
Home Made Geophone Detects Foot Steps - 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. . . . Hobby Circuit designed by David Johnson P.E.-June, 2006
Human 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. . . Circuit by Dave Johnson P.E.-July, 2006
Human Traffic Footstep Detector Preamp - 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 micro amps from a 12 volt supply. . . Circuit by David A. Johnson P.E.-July, 2006
Infrared Detector - 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 __ Designed by Tomi Engdahl
Infrared Detector - 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 __ Designed by Soylis Papanastasiou
Infrared gate 2 - 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 the output is turned on can be separately controlled by a second timer. __ Designed by Peter Jakab
Infrared Motion-Sensing Relay Switch - This circuit is designed for use with all kinds of medium-power automobile/domestic 12V DC loads. it is a simple solid-state relay (SSR) switch, controlled by a standard passive infrared (PiR) motion...__ Electronics Projects for You
Intrusion Detector-Video - This device uses a PIC 16F819 and an LM339 to detect motion on a video signal. The incoming video is 'clamped' using one section of the LM339, the sync tips are detected with another section, and a 3rd section can detect VBI or other data. __ Designed by Luhan Monat-Mesa Arizona
IR Detector for Robot - How to build a simple IR detector, schematics and alternate links __ Designed by DC Reagan
IR Detector/Emitter - This is a very basic infrared detector/emitter circuit. One major downside of this circuit, is that ambient infrared light will interfere with its detecting obstacles __ Designed by Andy Wilson
KC7783R PIR Module - Find out more about the economical and easy to use KC7783R PiR motion sensor module. __ Designed by REUK-Renewable Energy UK website
Light/Dark Activated Motion Detector - This circuit can sound an alarm when the shadow of a hand or arm moves over two small photo diodes. . . Circuit by David Johnson P.E.-August, 2005
Low cost video Motion Detection - This device uses a PIC 16F819 and an LM339 to detect motion on a video signal. The incoming video is 'clamped' using one section of the LM339, the sync tips are detected with another section, and a 3rd section can detect VBI or other data. __ Designed by Luhan Monat-Mesa Arizona
Make a Geophone to Detect Foot Steps - 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.. . . Circuit by Dave Johnson P.E.-June, 2006
Motion Controlled Blinking Eyes - 13-May-14 -Design News: This is Mark iI of my Animatronic Eyes, which was created for someone who wanted to animate a rock sculpture. The eyes themselves were made with plastic Easter egg tops, which fit perfectly as eyelids over ping pong balls. The problem there becomes one of mounting and alignment. in this version,__ Gadget Freak-Case #254
Motion Detector Alarm - This motion detector alarm circuit can detect a moving person from a distance of 1 meter. it uses a Dual IR Transmitter-Receiver module HOA1405. When the sensor detects the reflected IR rays, Alarm will sound for 2 minutes. The circuit can be modified for various applications including AC operated alarm systems. Motion __ Designed by D Mohankumar
Motion Sensing LED - Hack your box of chocolates with arduino iDE and ATtiny13. __ Contact Jameco Electronics
Motion Sensor for Security Light - Here is a system based on PiR motion detector module BS1600 (or BS1700) that can be used for security or corridor lighting in power-saving mode. The 12V DC power supply required...__ Electronics Projects for You
Motion Sensor Light Switch - 3-Sep-15 -Design News: Are there light switches in your home that aren't as conveniently located as you would like? This laser-based switch decoder and driver allows for flexible control of those lights located in less than ideal places. I live in an apartment. My kitchen is boring and can be accessed from either end of __ Gadget Freak-Case #272
Now That's Sneaky - Turn on an appliance with the wave of your hand! __ Contact Jameco Electronics
Optical Fiber Pressure & Motion Test - The circuit uses an off-the-shelf bright red LED light source, designed for plastic optical fibers. It also uses a matching phototransistor light detector. The devices are designed for plastic fiber. I would suggest you keep the total fiber length less than 50 feet. Bending or stepping on the fiber will produce a detectable output signal. . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 15 Jan 2011
PIR Camera - A simple automatic motion-detection Digital Camera. __ Contact Collin Mitchell
Pressure_&_Motion_Test_for_Optical_Fibers - The circuit uses an off-the-shelf bright red LED light source, designed for plastic optical fibers. It also uses a matching phototransistor light detector. The devices are designed for plastic fiber. I would suggest you keep the total fiber length less than 50 feet. Bending or stepping on the fiber will produce a detectable output signal. . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 15 Jan 2011
PWM fan controller in an EMI-susceptible - 02/16/06 EDN Design Ideas: Control it with either an external negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus serial-data bus Design by Dimitri Danyuk, Niles Audio Corp
Scare Off Pigeons - 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 . . . Hobby Circuit designed by David Johnson P.E.-April, 2005
Shadow Activated Motion Detector - The hobby circuit below works quite well in typical indoor room lighting. I would not recommend its use in direct sunlight. Two small PIN photodiodes positioned about one inch apart form a shadow detector. With no shadow cast on the devices, both device . . . Hobby Circuit designed by David Johnson P.E.-August, 2005
Simple Circuit Motion Detecting camera using PIR passive infrared - A simple automatic motion-detection Digital Camera. __ Designed by Collin Mitchell
Solenoid trip works at battery's end of life - 8-Jul-04 EDN Design Ideas: This design idea involves a low-power motion-detector circuit that operates from battery power for extended times. Part of the design includes a solenoid-operated trip mechanism that triggers whenever it detects motion. The drive circuit for the solenoid in the original design worked fine as long as the battery was fresh but failed as the battery got into the middle of its life, even though suf Design by Brad Peeters, Theta Engineering, Costa Mesa, CA
TiltStick, a Motion sensing Device - The TiltStick is a small acceleration sensing device in form of a USB stick. it's using a two axis acceleration sensor to measure acceleration (caused e.g. by motion and tilt). The device is emulating a USB joystick and can thus be used in conjunction with any USB equipped host (e.g. a standard PC or the Nokia N8XX family) without any special drivers. The TiltStick is the successor of the Tilt Dongle for Palm OS. __ Designed by Till Harbaum <Till @ Harbaum.org>
Ultra Low Power Human Finger Detector - The circuit below seems to work well and averages a current drain of only 10 microamps from a lithium cell. it uses a single CA4013 dual D flip/flop. One section is wired as a pulse generator. it applies 10us 10ma pulses to a LED inside a slotted optical sensor at a rate of about 50Hz. The phototransistor in the second half of the sensor detects the pulses and sends a pulse to the data input of the second flip/flop in the 4013 package. if there is nothing between the LED and the phototransistor, the inverting output of the 4013 remains low.Circuit Solution by David Johnson P.E.-May, 2006
Use a PWM fan controller in an EMI-susceptible - 02/16/06 EDN Design Ideas: Control it with either an external negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus serial-data bus Design by Dimitri Danyuk, Niles Audio Corp
Video Motion Detection - This device uses a PIC 16F819 and an LM339 to detect motion on a video signal. The incoming video is 'clamped' using one section of the LM339, the sync tips are detected with another section, and a 3rd section can detect VBI or other data. __ Designed by Luhan Monat-Mesa Arizona
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