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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 Dave Johnson P.E., 08/21/05]
Short Range Reflective
Object Sensor - Drawing only 30uA from a 3v supply,
this circuit will detect a human finger with a range of about 1 inch. The sensor uses an inexpensive infrared LED
and a matching photo diode . . . [Circuit by David A. Johnson P.E., 07/09/06]
Simple Infa-Red Remote Control - Infrared based electronic circuit diagrams / circuit schematics. . . [Designer's name not
included]
Simple infra-red detector - Infrared based electronic circuit diagrams / circuit schematics. . .
Simple Infra-Red Detector - . . . [Designed by Tomi Engdahl]
Simple Infrared Remote Control - This article will show you how to use the components in our infrared data communications
parts KIT. . . [Reynold's Elec]
Simple IR Detector - . . . [Designed by Tomi Engdahl]
Simple IR transmitter circuit - Infrared based electronic circuit diagrams / circuit schematics. . .
Simple IR Transmitter Circuit - . . . [Designed by Tomi Engdahl]
Simple Wireless Radio Data Link - This is a description of a very simple unit designed and constructed for use as a wireless
data connection between two nearby computers. The error rate is excellent over short runs, and the transmission
speed means that a useful PPP link can be established between the machines. Which are, of course, running Linux.
. .
Six channel IR remote system with micro PIC 16F84 - This project is a remote control system based on a pic and an universal remote controller
for TV, named SIMPLEX. . . . [designer identified as Alfred73]
Smartcard-controlled Relay - From a designer's perspective, there are no "good" or "bad" circuits. This article will show
how to transform a "pirate" smart card (cheaply available almost everywhere nowadays , as consequence of digital
TV piracy plague) into a legal and pacific electronic key application. Opposite to popular belief, most TV
smartcards are not clones of the original and trusted ones. Instead, they often are minature versions of general
purpose microcontrollers, well known to the electronics enthusiasts, like PICs from Microchip or AVR from Atmel.
. . . [Alberto Ricci Bitti]
Solar Powered
Infrared 1W Security Camera Illuminator - Many
security cameras are equipped with an array of infrared LEDs to illuminate an area in front of the camera with
invisible light for night time surveillance. However, there are times when a remote area, well away from the
camera, needs additional infrared light. The circuit below uses a modified solar powered path light to bathe a
fairly large area with 850nm infrared light . . . [Circuit by David A. Johnson P.E., 06/22/14]
Stable 40kHz Clock (Rodney Radford) - ASCII format-A circuit that I have used before is based on the CD4060 (14stage binary
counter) and a 640Khz ceramic resonator. The CD4060 is basically an oscillator and a ripple counter to divide the
640khz down to something more usable. . . .
Supply Voltage Indicator - Circuit designed by Miroslav Adzic. This simple and slightly odd circuit can clearly show
the level of the supply voltage (in a larger device) : as long as the indicator has good 12 volts at its input,
LED1 gives steady, uninterrupted (for the naked eye) yellow light. If the input voltage falls below 11 V, LED1
will start to blink and the blinking will just get slower and slower if the voltage. . . [Miroslav Adzic-Serbia
& Montenegro]
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