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.
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.