Indian Institute of Technology Hyderabad DIGITAL SECURITY SYSTEM By R.Sree Harsha M.Sai Sudeep Reddy.

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Presentation transcript:

Indian Institute of Technology Hyderabad 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.  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  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 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