This laser pointer can be used for signaling purposes. Do-it-yourself laser signaling: necessary components, diagram

Compact commercial security systems and serious alarm systems are not always needed for the skin. Its quality, installation and maintenance are perfect for the protection of expensive objects. If you need to install a security system at your dacha or in the garage, at your apartment or in your cabin, then spending money on a ready-made, well-purchased alarm system is often not compatible with your budget. With cheap security alarms that are available on the market, it is easier to see (especially with radio controls - they have long been learned to be scanned and turned on without any problems). Which one is simpler and definitely much cheaper set up a simple self-alarm For example, as one of the options, laser security alarm.

Today, there are a lot of different laser signaling schemes in use, but, as a rule, such devices can be completed with a folding design. The natural design of such a device cannot be done without microcircuits and simple wiring. Then you need to adjust and start, select capacitors, resistors, etc. Microcircuits also require soldering. It can be caused by overheating or static and it will take a long time to understand why the laser does not work. Therefore, it is advisable to skip this very tedious piece of circuitry and take a ready-made Chinese laser (from any toy store - it’s not expensive - everything is ready - the body, the lenses and the circuit). Get the circuits ready for use by any radio-amator.

The circuit in this post laser security system that reacts to interruptions and consists of a viprominuvach (laser pointer power) and a device that can be used to remove the intermediate mirrors, which are necessary for the mirror of the exchange and the device of the op. ovіshchenya - vidlyakuvacha (siren, light). You can connect other notification devices, for example, a mobile phone for sending SMS or just calling (Under this number you will have a client - “Requested alarm”). Testing of this system was successful and is in use to this day.

The signaling works like this - if a person moves through the area, the laser stops illuminating the photocell of its support and the relay is activated. When the relay is connected, the laser also blinks (this is designed so that after a person leaves the activation zone, the laser does not continue to illuminate the photocell, so that in such a situation the alarm will sound for a second and shut down). This is the simplest scheme.

When the laser illuminates the photocell, the remaining lanyard operates as a dart, and when the laser is turned off, it turns into a resistor with a large support. The photocell (photoresistor) must be installed closed from all sides of the housing, and the tube is cut out from the body of the handle and covered with black insulating stitch to prevent light from penetrating into the photocell.

As they already said, like a laser, a ready-made module is installed - a toy laser with a red viper, running on 3 batteries with a voltage of 1.4 koz. Darts are soldered onto the laser, the fragments of the wine live in a life block with a voltage of 4-4.5 volts, since batteries are not an option for us. The laser is connected directly to the main body, and through a resistor with a 5 ohm support. Press the support 1 watt. The activation zone can reach up to 10 meters of land.

The relay has three contacts that turn on the laser and turn on the siren. You can build the relay yourself or get ready. I had a ready-made relay, but with a rewound winding, the fragments of the relay initially ran at 12 volts. The relay winding contains 60 turns of a dart with a diameter of 0.4 mm.

The design of the device - notification device - drainage can be set ready or built independently. One of the options.
Increasing the tightness of the contacts on the widening of the TDA2005 integrated circuit. Supporting the bridge switching option, this ensures a high output voltage of 20 W! The module with booster is not installed on the radiator, as this will cause problems; the remaining booster operates from a low voltage supply of 4 - 4.5 volts, and before that, it will be possible for the entire hour to turn on.

The capacity of the input capacitor can be changed over a wide range. The smaller the capacitor capacity, the louder and more annoying the sound of a siren becomes. You can also use the booster on the TDA2003 microcircuit, but the result will be slightly worse (the thickness of the lilac will be half as much). The dynamic head type 25 is similar. It is possible to tighten the head (with the head the result is much better). Sound generator (simulator of sirens, sounds on a logical element K155LAZ.)

The circuit of such a generator is very similar to the circuit of a transistor symmetrical multivibrator. The impulses generated by the microcircuit elements are converted by a dynamic head into a sound ring. The duration of the pulses is indicated by the capacities C1, C2 and supports R1 and R2. The device consists of two generators: clock pulses and audio frequencies. The first viconanium is on elements DD1.1 and DD1.2, and the other is on DD1.3 and DD1.4. Skin from collection generators using an asymmetrical scheme. The imitation of the sound of a siren is achieved by the fact that the clock generator operates as a sound frequency generator. The dynamic head BA1 sounds at the interval of an hour, as at the input 13 of element DD1.3 it is logical “1”. Output 6 of element DD1.2 follows direct-current pulses that are generated by a sound generator, the frequency of which lies within the ratings C1 and R1. I’ll give you two options for imitating the sound of a lilac, which you can choose for yourself. The dynamic head must be selected from the simulator circuits and connected to the audio frequency booster input.

The power supply unit is a 20 W hembar transformer. Since the entire alarm system operates on a voltage of 4 - 4.5 volts, it is necessary to take a edge transformer with a voltage of 12 or 6 volts and recycle the secondary winding. The primary winding contains 40 turns of a dart with a diameter of 0.7 mm (it is necessary to experiment with the number of turns, using a working voltage of 4 - 4.5 volts. After completing the other devices (simulator, sensor, power booster information) proceed before assembling the device. The laser must be placed in such a way that it passes in different directions directly into the tube with the photocell and provides it to the robot.

We turn on the device this way - first press the button, then press the button that activates the laser and gently lower the button (the button is not locked). My device has two power boosters installed to eliminate the booming sound. The sensor is made from a collection relay near the housing in the form of a Chinese lighter. Then, after installation and switching on, we go to the activation zone and pass through it. Mittevo activates the relay and the alarm system requests.

Let's create another circuit for receiving a laser security alarm on transistors

This is a diagram of a security alarm using a laser beam sensor. The scheme consists of two main blocks:
1. photo relay (VT1, VT2);
2. Hour relay (VT3, VT4).

The scheme is implemented in this way.
The photorelay sensor is the photoresistor R1, which switches on at the base of the transistor VT1 in series with the resistor that interconnects R2. The dark performance of the photoresistor is great. The collector circuit of transistor VT1 is small at this time and transistor VT2 is in the open state. This collector flow flows through the coil of relay KV1, thereby keeping the contacts in the closed position. When the photoresistor is brightened, its support changes, which leads to an increase in the flow of the base circuit of transistor VT1, and subsequently, an increase in its collector flow. The voltage drop across resistor R4, resulting in the flow of the collector flow of transistor VT1, closes transistor VT2 and KV1 relay turns on. Thus, when the photoresistor is illuminated by the laser, relay KV1 is turned on, and when the attacker switches it over, with its contact KV1.1, start the clock relay and turn again at the output station.
The relay usually operates in this way. At the output stage, if contact KV1.1 is opened, the voltage on capacitor C1 is equal to zero. At this time, transistors VT3 and VT4 are closed, there is no flow through the winding of relay KV2 and its contacts turn on the final switching mechanism (contacts are not indicated in the diagram). When relay KV1 is activated for a short time, capacitor C1 is charged and begins to discharge through the terminal junction of transistor VT3 and resistor R8, when transistors VT3 and VT4 are opened, relay KV2 orders and with its contacts turn on the terminal furnace nіzm.
After the capacitor discharges, the circuit rotates at the output station. Resistor R6 can regulate the timing.

At the worker's station, when the attacker crosses the laser exchanger, a circuit will be generated and the warning system will start (for example, sound or light signaling), after an hour it will turn on and check the attacker again, so that he can return to the exit station without being handed over. This is especially important for the protection of distant objects, for example, a garage or cottage.

The laser output has only a small range of differences, so it can be used to control large areas of perimeters. Once the system of mirrors has been installed, you can control any placement or make sure that the mirrors are clear and clean.

Also, to protect any object, you need to attach a mirror-finder (add a piece of paper measuring 1 x 1 cm) and install the attachment and adjuster so that it hits the photosensitive element, becoming visible. d mirrors.

However, in case of slight displacement (or displacement) of the object being protected, please exit the receiving window and the system will respond.
In order to reduce the sensitivity of the system, so that it does not interfere with the ground when moving, for example, through an important vehicle that is passing through, it is necessary to slightly change the optical design, making the input of the photo receiver so as on a baby.

Priymach for laser defense system
1-lens, 2-hood-tube, 3-photo receiver, 4-body

Why do you need to insert a zoom lens with a focal length F into the tube hood? The diameter of the lens and the significant sensitivity of the system (here it is not the electrical sensitivity of the photo receiver that matters, but the sensitivity that is rush up to the intensity of flowing onto the object that is being protected).

If, when the mirror is moving, the remaining laser beam does not go beyond the lenses, the sensor does not work. Also, by changing the diameter of the lens, you can adjust the sensitivity of the defense system.

A vikorist toy with a laser, which is used, as you know, for copies, can set off an alarm and be installed at the entrance to an apartment, garage, or door. There is no significant amount of money, but the benefits are immeasurably great.

To assemble the design, you will need a laser pointer and a number of radio parts. The principle of this alarm is based on the sensitivity of the photoresistor, which responds to the laser pulse.

This video shows how to set off a laser alarm. Why do you need a bunch of parts? The circuit of the device is based on a 555 timer. To detect laser vibration, we need a photoresistor. Connect with another resistor to cut off the voltage. The point of another resistor may be equal to that of the photoresistor. Our output is as good as 100 ohms. If the photoresistor does not tip over, its resistance will increase. This is to increase the voltage by 6 legs of the microcircuit. As a result, a logical zero appears at the output of the microcircuit and the beeper turns on.

You can turn off the speaker and reset the system by transferring the logical analysis of the speaker to trigger. By jumping back, let's turn the circuit to the ready mode.

To verify this, let’s take the diagram on a mock-up. If everything is done correctly, we will charge you a fee. Place the photoresistor on long legs to adjust the position after installation. Attach the battery pack to the plate with a glue gun. The free darts are secured to the payment with an elastic band. Now is the time to install the system. In the simplest form, it will be similar to the extension, so that there is one side of the door. Roztashovani one opposite the other. The kidney is secured with an alarm system. Use an adhesive stitch to secure the insertion button when it is turned on. We install the insert on site. It is better to adjust exactly to the center of the photoresistor. After this, turn off the system. Any entrance will activate the alarm. Alone stretching works efficiently. With the help of a few mirrors, you can cover the entire room with them. Secure the insert to one of the surfaces. Change the straightening to one wall. Continue chewing the mirror. Head, so that the power remains directed to the photoresistor.

The entire system consists of one continuous laser, even if the dose is too high to turn on the alarm.

The advantage of such an alarm system is that it is important to add a system of mirrors to the area. Please move the space along the impersonal channels, controlling the smallest plots of the Maidan.

To increase the efficiency of the robot, replace the batteries with heavier duty ones or rechargeable batteries.

Maybe you would like to learn how to understand the principles of working electrical circuits on a butt?

Dana laser pointer alarm, which you can make with your own hands, is similar to what we can see in various films. The alarm system uses a laser laser to protect your valuables and mine.

Essentially, if there is a fault between the sensor and the sensor, the support of the photodiode increases and as a result, a high voltage level appears at the output of the device, which can then activate the siren or Vikonavsky device.

Set the flow rate to approximately 10 mA. The laser pointer and receiver can be placed near the angle housing, and the laser beam can be directed to the photodiode behind the additional mirror.

Description of laser signaling

In the diagram, the operational booster TL072 (IC1.A) is configured as a voltage comparator. It equals the reference voltage at the input, which inverts, the op-amp (principal 3), which comes from the adjustable resistor segment on P1, R4, and the voltage goes to the direct input of the op-amp (principal 2) from the resistor, which is added to the photodiode D1 and stationary resistor R3 .

When the laser circuit is interrupted, the voltage at the output comparator 2 drops below the reference voltage at output 3. The result is a high level at the output of the 1st operational booster. As a result, this signal can be used by turning on the lilac, the computer or the spotlight, or, perhaps, the streamer.

Resistor R2 provides hysteresis to eliminate the instability of the circuits if there is voltage at both inputs of the level comparator. Capacitor C1 is used to ignore the non-trivial interruption in exchange for, for example, mosquitoes that fly. If you want the sensitivity of the alarm to be greater, you can change the capacitance of capacitor C1 to 1 µF.

The circuit is simple and can be assembled on a small piece of breadboard. After folding the lance and testing, you must place it in a suitable housing where there is an opening for the photodiode. It is important to insert the photodiode into the black color tube first in order to prevent the light from getting into contact with a third-party light source.