1. Elecbits

2. LASER BURGLAR ALARM SYSTEM
Description:
Laser burglar alarm system is used to detect any trespassing into the house, organization or any secured area.
It uses laser and Light Dependent Resistor (LDR) along with mirrors to protect area from any kind of intruder.
Only authorized personal can enter by disabling the laser with a security code.
Keypad matrix is used to enter the right security code before entering.
If anyone crosses the trap without entering the security code, the alarm will be activated.
This system can be a part of bigger home automation system also which can send messages to the owner, etc.

3. Block Diagram

4. Working
Laser Burglar Alarm System uses laser, a light dependent resistor and mirrors.
The laser covers the whole area with the help of mirrors. At the end the laser is set to fall on a light dependent resistor.
If someone wants to enter the secured area then he had to enter a correct security code using a keypad matrix.
Entering a correct security code will disable the system.
If someone tries to cross the laser trap without entering security code, the laser will be obstructed and this will make the resistance of LDR high and thus alarm will be activated by the microcontroller.

5. Schematics
Picture
Pcb Desgins

6. Thank You