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DIGITAL SECURITY SYSTEM. By R.Sree Harsha M.Sai Sudeep Reddy. What is Digital Security?. It is a type of security which can be used to prevent intruders from entering our home. The security system will sound an alert if there an attempt of break-in.

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DIGITAL SECURITY SYSTEM

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DIGITAL SECURITY SYSTEM

By

R.SreeHarsha

M.SaiSudeep Reddy


What is Digital Security?

  • It is a type of security which can be used to prevent intruders from entering our home.

  • The security system will sound an alert if there an attempt of break-in.

  • This is mainly used to minimize chances of losing possessions which can be traumatic and expensive.

  • When the intruder breaks in, the alarm will sound and most times will scare them off.

  • Limitations : The alarm will sound even if the user or his friends enter his home, providing an inconvenience to the user.


Why is this needed?


Circuit Diagram


Electronic Components

  • 5 Resistors: One 470 ῼ

    One 1K ῼ

    Three 47K ῼ resistors

  • Semi-Conductors: IC 1 – CD4511

    IC 2 – CD4000

    Q1 – BC 548

    Display – LTS 543

  • Miscellaneous: Two one way switches

    BZ – Buzzer

    IC Socket – 16 PIN-1 , 14 PIN-1

    PCB


Circuit Construction

  • Wire loops 1,2 and 4 are connected to A,B and C inputs of the 7-segment decoder (IC 4511) while the D input of IC1 is grounded permanently.

  • The loops are also connected to a dual 3-input NOR gate which is then connected to a NOT gate to activate the alarm.

  • The 7-segment decoder is connected to a common cathode 7-segment display(LTS 543).


Brief Mechanism of Circuit

  • LTS 543 displays whether the loops are intact or not.

  • When the loops are intact, all the three inputs of the gate N1 remain low to give a high output.

  • This high output is further given to the NOT gate and as a result the final output remains low. This keeps the transistor in cut-off position and hence the buzzer does not sound.

  • When any loop is broken, the output of the N1 gate goes low.

  • As the input of the NOT gate is low, the final output will be high.

  • As the final output is high, the transistor conducts and the buzzer sounds to alarm the owner.


  • If the loop 1 is broken, the 7-segment display will show ‘1’.

  • Similarly if the loop 4 is broken, it shows ‘4’.

  • If both the loops 1 and 4 are broken, then it shows ‘5’ (1+4).


THANK YOU


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