|
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) |
|
Electric Field Disturbance Monitor-1 - 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. ….(designed by David A. Johnson) |
|
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) |
|
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 ....(electronic circuit added 7/03) |
|
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) |
|
Motion Alarm Using Piezoelectric Device - An inexpensive piezoelectric device is
used as a motion sensing device for this motion alarm. (added 7/06) ….(designed by
David A. Johnson) |
|
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.... ….(designed by David A. Johnson) |
|
PIR Camera - A simple automatic motion-detection Digital Camera. (circuit
added 05/09) |
|
PIR Motion Detector - (circuit / schematic design added 6/06) |
|
Shadow Activate Motion Detector - This circuit can sound an alarm when the shadow
of a hand or arm moves over two small photo diodes. ….(designed by David A.
Johnson) |
|
Solenoid trip circuit works at Battery's end of life - 07/08/04 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 idea added 10/05) |
|
Ultrasonic Remote Control & Alarm - (electronic schematic / circuit added 4/02) |
|
Use a PWM fan Controller in an EMI susceptible circuit - 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 idea added 9/08) |
