Security device Laser stretching. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Security device "Laser stretching". Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling

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This circuit can be used as a security device that reacts to a beam break between the laser and the sensor, as well as how to work with reed switches by turning it on x1.1 and x1.2.

The VD1 LED indicates the presence of a beam on the sensor by going out, and the beam is broken if the LED is on.

By pressing SB1, the device becomes armed, the VD2 LED lights up.

By pressing SB2 the device is disarmed.

By pressing SB3/4 set the brightness of the laser beam.

The presence of jumper J1 sets the trigger delay to 10 seconds.

The presence of jumper J2 sets the arming delay of 30 seconds d (LED VD2 is lit).

When triggered, a relay is turned on, which can turn on, for example, a siren (for 30 seconds). After that, the device is automatically disarmed.

(click to enlarge)

The circuit can be used without a chain with quartz, the controller must be programmed for an internal generator.

About replacement parts: VT1 any low-power npn, VT2 / 3 analogues of medium power npn, any relay for 12 volts, DA1 - KREN5A.

The laser diode is carefully pulled out of the case and the wires are soldered, other types of photodiodes can serve as a sensor, depending on the setting (changing the sensitivity by adjusting R1).

The sensor is mounted in a suitable small tube to non-white light by extraneous radiation. The laser and sensor are mounted on a substrate so that the sensor can be rotated towards the direction of the beam.

Security device "Laser stretching". Operating principle

Download firmware file and source code

Author: Knyazev I.S., Knazevis_[dog]mail.ru or Knazev[dog]land.ru, ICQ: 455864760; Publication: cxem.net

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