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Simple laser alarm for a summer residence or garage

Hello everyone. From several ready-made blocks you can make a simple alarm for cottages or the garage. A relay of 10 amperes can load a siren, a searchlight, or another deterrent device.

What do we need for this:
1- ready sensor with sensor
2- laser diode power supply
3- laser diode itself
4- power supply for 220 to 12 volts 500 mA any.

The laser is powered by a voltage of 2.8 volts, on the block we set this value.

We connect the sensor unit to the power supply and connect it to the power supply of the laser diode, which already has a voltage of 2.8V


A laser with a power supply is installed on one wall of the garage and a receiver on the other wall.

When the laser shines on the photosensitive element of the sensor, the relay is open, as soon as the beam is interrupted, the relay activates and turns on the security siren. So that the relay does not immediately turn off after the robber leaves. It is necessary to install a delay relay, of which there are many in the network.
Simple laser alarm for a summer residence or garage

The laser and the photosensitive element must be installed in the pipe section so that extraneous light does not interfere. With the help of mirrors, this device in the country house can protect all windows and doors, although such devices must be installed in each room one at a time. Mirrors are installed in the corners of the room and close the beam to the sensor. You can also connect to this device an old mobile phone with a SIM card and it will report on the penetration of SMS.
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12 comments
Author
Quote: sedoi1
Collecting something similar even at the dawn of laser pointers.To increase the laser life, you need to modulate it with a duty cycle of about 10 and synchronize the pulses with the receiver.

A blinking laser will also work .. no problem.
Collecting something similar even at the dawn of laser pointers. To increase the laser life, you need to modulate it with a duty cycle of about 10 and synchronize the pulses with the receiver.
I did it for a pensioner at the cottage ... At a laser pointer with pulse battery power. Consumption is small and does not overheat. Serious receiver with amplifier (with transfer to a guard post in the house). And there was a difficulty in aiming the beam (distance ~ 20m). I don’t remember which spectrum was made (IR? Filter)
I wish to buy this little thing. Too lazy to collect ... Who?
Author
There are expensive lasers that do not burn .. you can take a green laser pointer - the same
The levels are not such lasers and they do not work around the clock.
Author
There are different diodes, they have been working in laser levels for 20 years .. and he guards the whole day .. only when there is no one in the country. Yes, this toy is a useful toy and cheap.
Quote: Coudeyar
Look at the price of this laser - you can change it every six months. !!

Just don’t forget ... Isn’t it easier to make something more reliable, and not such a toy that requires accurate installation (do not forget that the walls of many, not all, but many, summer cottages have small displacements in time and from precipitation of the foundation, and from changes in humidity and air temperature.)
Author
Practical devices typically operate with a current of 20 to 40 mA above the threshold and can generate light output from 1 to 10 mW in continuous mode and even more when pulsed with low-performance cycles.

Look at the price of this laser - you can change it every six months. !!
Therefore, we must not forget to change them once every six months. Not very good for signaling.
Author
Hello ! If 5000 hours do not overheat
And what is the resource of these lasers?

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