Security system using laser
- 1. Security system using laser
- 2. Introduction • With increasing number of crimes it is necessary to strengthen the security of important and valuable things. So we selected a security system as our project. • The crime gangs are using technology, so we have to think about technology also. • In this project we will implement a small circuit with laser light to show how it can be used. • We know laser light can go through a long distance without scattering effect and also invisible.
- 3. Introduction cont. • These two properties will help us to build a modern system against modern crimes. • We will make a boundary by laser light if anyone come between the laser and the sensor the alarm or led will on.
- 5. Used components in the circuit: • LDR(Light dependent resistor) – It works with the change of lights. If the amount of light on it is high this resistance will become huge , so there will be on current flow through it. • Transistor(BC 548 npn) – When a selected amount of current flow through this it starts working. Mainly it works as a switch of the circuit. • LED – It used for the alarm purpose only. It can be replaced with buzzer. • Battery – A 9v battery is used as a power. • Resistors(100ohm) – 4 resistors.
- 6. Simulation
- 7. Some details… • It mainly works on the ohm’s law(V=IR). When 9v dc supply is given as source it flows thorough the LDR. As the resistance of the LDR dependent on light if the light amount is high on LDR it becomes highly resistive and becomes a barrier between source and the whole circuit . So minimum voltage for turning on the transistor is not flowed and the rest of circuit stay off. If light amount is less or zero LDR become short or resistance of it become zero then the whole circuit become on.
- 8. Cost Analysis: • For making this small circuit the cost is very low. • We used 2 transistors, 1 Led, 1 LDR, 1 9v battery and a breadboard. • Total cost of these is under 100 tk only. • If we want a implement it in bigger places we just needed some mirrors. So the total cost will increase as the mirror costs. • As this circuit is very easy to implement , Anyone with a basic knowledge of circuits can implement it . So here is no implementation charge.
- 9. Applications • Office security – Restricted areas in office can be secured by laser security • Home security – As the costs are not why this set up can be used for home also • Valuable things protection – With some extra works in setting up the security system , this can be used in any place. • In shops it can be also used.
- 10. Future Work • The implemented circuit is a basic circuit. It can be improved in many ways. • It can be improved by adding various features. • A network device can be added with this which will transmit data to a selected mobile phone. Any unauthorized entry can be stopped by this device. • By perfect mirror positioning this little circuit can be security guard for a huge area. • Motion sensors can be added to improve security.
- 11. Conclusion • This whole security system is easy to construct. • Consume less power • Economical and light weight Not only these but also thieves and crime gangs can be caught easily by this technology based security. This thing is better than many other security system found in the market. For being invisible it is like a trap. It can be set anywhere for its light weight .
- 12. Thank you
- 13. Group members: • MD HASIBUR RAHMAN TOMAL (17-35018-2) • AYESHA SIDDIKA (17-35220-2) • MD. SHAMS ARAF SHOVON(17-34487-2) • ASIF ARMAN OME (17-35441-3) • SIAM HOSSAIN(18-37650-1)