1. LASER SECURITY ALARM[140] DIRECTOR OF MGM’s COE,NANDED
Tone Shital & Sukte Uma[54]
MGM’s College of Engineering , Nanded[50]
Abstract[40] :
Security[32] is main concern for various buildings, houses and offices. For this purpose, there are a variety of security alarms available in market.
To give security to society. For this purpose, we are implementing this laser security alarm circuit.
Working:
In this circuit we have set reference voltages of comparators by using potentiometer, we can say this sensitivity of the circuit. Comparator is configured in non-inverting mode. In this system we have placed laser light and LDR facing each other, so laser light continuously falls on LDR. Due to this a potential difference generated across the non-inverting pin of comparator, then comparator compare potential difference with reference voltage and generate this digital output as HIGH. Before this we have configured 555 timer in mono-stable mode so we it required a LOW trigger pulse at its trigger pin to activate buzzer and LED. So we applied output of comparator at trigger pin of 555 timer. Even comparator’s output is HIGH when laser lights falls on LDR so at this time buzzer and LED are deactivated. When someone crosses the laser light due to this LDR lost the laser light and generates a different potential difference across the same comparator terminal. Then comparator generates an output as LOW. Due to this LOW signal 555 timer gets a LOW trigger pulse and activates buzzer and LED for a time periods that is defined by R1 and C1 at 555 timer circuit.
Fig 1. Circuit Diagram
Advantages :
Easy to install and work both within as well as outside homes
Consume less power, though the laser system on the whole is expensive.
Disadvantages :
Laser security system requires resources to run, add complexity in IT environment and requires effort by those using the systems
Conclusion :
In the end, we made the laser security in low budget. It had been protect in full security. Laser security systems are a high tech technology that used to be a part of home security only available to the wealthy. It is manually switch dependent sensors and a basic alarm unit. Laser security system ,a person moves in front of the motion sensor, that person’s body heat triggers the system’s alarm. And the alarm signals the security monitoring company and local law enforcement. The basic alarm unit will also sound a loud alarm.
1. Millman’s Electronic Devices and Circuits by Millman Halkias & Satyabratajit (2nd edition, McGraw Hill Publication.
Application :
Lasers and laser technologies are widely used in defence and security fields.
Used to protect valuable items , money , room etc. . By using different mirror arrangements.
References :
Introduction :
Security is main concern for various buildings, houses and offices. For this purpose, there are a variety of security alarms available in market which uses various types of technology for intruder detection like infrared sensors, motion sensors, ultrasonic sensors, laser sensors, etc. We have also built some security alarms like this PIR sensor based motion detector and burglar alarm circuit. In this circuit we are going to build a laser security alarm which uses a laser light and a laser light detector circuit. It gets activated when someone crosses it. .
Results :
The field of alarms and sensors is a very developed one. New and improved types of alarms and sensors are always coming into the market. An Security system is comprised of a main control box to which sensors are connected. When the sensors identify a break-in, they send out a signal to the control box, which, in turn, sounds the alarm or performs other predefined tasks.
It is a simple circuit using LM358 OP-AMP and LM555 Timer. This circuit is triggered when the Laser beam falls on the LDR interrupts, which sounds the buzzer connected to it. This can be used to protect your valuable items , money, room etc.. By using different mirror arrangements you can form different security system.
Acknowledgement: We would like also to thank our Guide Mr. A. A. Mane for their inspiration, guidance & support. This constant source of encouragement, support and motivation helped us in a long way throughout the project phase.
Mr. A. A. Mane
MINI PROJECT INCHARGE
Dr. Ms. K. C. Jondhale
PROF & HEAD OF ECT DEPT.
Dr. Mrs. G. S. Lathkar
DIRECTOR OF MGM’s COE,NANDED