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555 Based IR Proximity Detector - Sometimes you want a simple solution to a
problem and you don't mind if your main controller has to do the work. This IRPD
requires the main robot processor to choose which side to look at, and.... (added
05/06/07) |
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Doorknob Proximity Alarm - Reverse engineered circuit diagram of a popular retail
doorknob alarm. It contains a small transmitter and the doorknob acts as an antenna so
it will not work on a metal door. When a person comes close to the doorknob this loads
down the oscillator and the alarm sounds. The proximity sensor circuitry is perfectly
capable of driving 74HCT series CMOS logic instead of the noise maker IC's shown in
the circuit diagram. (added 2/05) |
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DTMF Proximity Detector - (electronic Circuit / Schematic added 10/04) |
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Dual Comparator - forms temperature-compensated proximity Detector (app note added
8/03) |
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Dual Comparators Stabilize Proximity Detector - 02/16/98 EDN-Design Ideas / (added
3/03) |
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Infra-Red IR Beam Alarm/ Proximity Detector - This circuit can be used as an
Infrared beam barrier as well as a proximity detector. The circuit uses the very
popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the
circuit are for the Sharp & VIshay modules. For other modules please refer to their
respective datasheets. The receiver consists of a 555 timer IC working as an
oscillator at ... (added 11/06) |
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Infra-red Level Detector - Useful for liquids level detection and proximity
devices Up to50 cm. range, optional relay operation (added 4/05) |
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Liquid Level Detector - (added 6/06) |
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Magnetic proximity sensors - Here is an interesting circuit for a magnetic
proximity switch which can be used in various applications. The magnetic proximity
switch circuit, in principle, consists of a reed switch at its heart. When a magnet is
brought in the vicinity of the sensor (reed switch), it operates and controls the rest
of the switching circuit.... (added 09/05) |
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Proximity Alarm #2 - (circuit / schematic added 2/03) |
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Proximity Detector - Here is a Simple But Very Effective One....(electronic
schematic added 12/08) |
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RS-232C Link Monitors Animal Activity - 11/06/97 EDN-Design Ideas / (added 3/03) |
