TO DESIGN A TIMER BASED CODE LOCK

PREPARED BY:- Akashdeep Singh B120020024 Alisha Bansal B120020029 Pratibha Kochhar B120020191 Puneet Deewan B120020198

CONTENTS Introduction Working Components Theory Circuit Diagram Advantages Future Development Acknowledgment Conclusion References

INTRODUCTION

This system unlock the lock by using pre decide password, increase the security level to prevent an unauthorized unlocking.

In case the user forgets the password this system gives the flexibility to the user to change or reset the password.

This automatic password based lock system will give user more secure yet cost efficient way of locking unlocking system.

WORKING An essential property of this electronic code is that

it works in a monostable stage i.e. Once triggered the output becomes high & remains for some period of time.

In the 555 IC, pin 2 is triggered input pin which held below 1/3 of the supply voltage, drives the output to high stage.

The threshold pin 6 held higher than 2/3 of the supply voltage, drives the output to low stage.

COMPONENTS

IC 555 CAPACITOR RESISTOR SWITCHES LED

S. NO. COMPONENT QUANTITY

1. IC 555 1

2. LED 1

3. SWITCHES 7

4. RESISTORS 5

5. CAPACITORS 3

THEORY IC 5551. 555 is a very commonly used IC for

generating accurate timing pulses. 2. It is an 8pin timer IC and has mainly

two modes of operation: monostable and astable.

RESISTORS1. Resistor is a passive component used

to control current in a circuit.2. Its resistance is given by the ratio of

voltage applied across its terminals to the current passing through it.

3. Thus a particular value of resistor, for fixed voltage, limits the current through it.

CAPACITORS1. Capacitor is a passive component

used to store charge. 2. The charge (q) stored in a capacitor is

the product of its capacitance (C) value and the voltage (V) applied to it.

LED1. Light emitting diodes (LEDs) are

semiconductor light sources. The light emitted from LEDs varies from visible to infrared and ultraviolet regions.

2. They operate on low voltage and power. LEDs are one of the most common electronic components and are mostly used as indicators in circuits.

SWITCH1. In electronics, an electronic switch is an electronic

component or device that can switch an electrical circuit, interrupting the current or diverting it from one conductor to another.

CIRCUIT DIAGRAM

ADVANTAGES

1. It is very simple in construction.2. Its weight is less easily bearable.3. It is perfect for locking that documents which

are used all times because it is easy to operate.

4. We can easily change the combination password as we like best at any.

FUTURE DEVELOPMENT

1. We can add voice feedback to open the lock.2. Complexity of the lock can be altered using

different no. of switches.

ACKNOWLEDGMENT We would like to thanks to our university who

gave us an opportunity to work on the project “Timer based code lock”.

We like to acknowledge our teacher Miss. Monika Parmar who was always ready with a positive comment and for assisting with data collection for this project.

We would also like to thank our friends and parents for their moral support.

CONCLUSION It is always better to start every design with

a good proposal, which will stand as a reference point to the work as it proceeds.

The result of any design gives joy if aims and objectives are met. Since the project performed according to our need it is indeed satisfactory.

This project can be really helpful in replacing old locks with new & advanced technology which can safeguard our necessary & important things.

Thus, this design is a huge success.

REFERENCES1. http://www.engineersgarage.com/electronic-

circuits/timer-based-code-lock 2. http://en.wikipedia.org/wiki/

Electronic_switch 3. http://en.wikipedia.org/wiki/555_timer_IC 4. http://wiki.answers.com/Q/

What_are_the_advantages_and_disadvantages_of_digital_code_lock