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Cspass

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Transcript

  • 1. Report on final year project CARD SWIPING AND PASSWORD AUTHENTICATION SECURITY SYSTEM (CSPASS)
  • 2. INTRODUCTION: Card swiping and password authentication security system is a security system involving a card swiping system after which a password is asked for granting access into a particular authorized area.
  • 3. DEVICES USED:
    • Microcontroller (AT89C52)
    • Power supply
    • U-shaped opto coupler(MOC7811)
    • Keys/push buttons(4 pin)
    • Relay(HK3FF-DC12V-SH)
    • Buzzer(SE B-20-B)
    • L.C.D(JHD 162A)
  • 4. External pull up resistors at pin 0
    • Microcontroller pins can broadly be divided into 4 sets i.e. P0, P1, P2, P3.
    • P0 pins are provided with pull up resistors externally because Microcontroller doesn’t have them internally.
    • Pull up resistors are provided for current limiting in the data transfer.
    • Reason for not using the other 3 pins being that they are dedicated for other functions like pin 3 is for interrupts.
  • 5. CRYSTAL OSCILLATOR
    • A crystal oscillator is an electronic circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency (11.0592 MHz in this case).
    • This frequency is commonly used to keep track of time, to provide a stable clock signal for digital integrated circuits .
  • 6. MICROCONTROLLER
    • 256 x 8-Bit Internal RAM
    • 32 Programmable I/O Lines
    • Three 16-Bit Timer/Counters
    • Eight Interrupt Sources Programmable Serial Channel
    • Low Power Idle and Power Down Modes
  • 7. PIN DIAGRAM
  • 8. POWER SUPPLY
  • 9. POWER SUPPLY WORKING
    • A center tapped step down transformer is used to convert 220V AC TO 12V AC.
    • When the power is supplied to the circuit, an LED glows indicating the circuit is receiving power.
    • The 12V AC is then converted to 12V pulsating (ripples) DC with the help of a bridge rectifier.
    • Then this 12V DC is converted into 5V DC by a 7805 voltage regulator .
  • 10. BRIDGE RECTIFIER WORKING
    • During +ve cycle, D2 and D4 conduct.
    • During –ve cycle, D3 and D1 conduct.
    • How to get a constant dc?
    • A diode’s internal resistance is given by Ri.
    • The time for charging of the capacitor is given by:
    • T=2*Ri*C
    • Ri and C both being small, the time taken for the capacitor to be fully charged is very less.
    • Thereafter, the next cycle starts after a slight bend of discharging of the capacitor.
    • So, we obtain an almost straight line i.e. a D.C. which is constant.
  • 11. U-SHAPED OPTOCOUPLER
    • It consists of an IR emitting diode facing a photo detector in a molded plastic housing.
    • A slot in the housing between the emitter and detector provides a means of interrupting the signal.
  • 12. KEYS(MATRIX FORM)
    • We have connected 12 keys (push buttons) in matrix form of 4 rows and 3 columns.
    • 10 keys represent digits 0-9 and the remaining 2 are for entering or canceling the password.
  • 13. RELAY:
    • Dimension(L*W*H): 15.5 x 10.5 x 10.8
    • Coil Voltage: 12V
    • Max .Switching Voltage: 300VAC/60VDC
    • Max Switching Power: 750VA /90W
    • Coil Power: 0.5W, 0.2W, 0.36W
      • If the password is correct, then the LED starts glowing indicating that the relay is switched on.
  • 14. BUZZER
    • Sound: 85 db
    • Input: 1.5V-27V dc
      • If the wrong password is entered thrice, then the buzzer starts ringing.
  • 15. L.C.D.
    • It is a 16*2 display which works on +5V power supply.
    • Initially it displays ‘CSPASS BY CITM’.
    • Then it displays ‘SWIPE CARD’.
    • When the card is swiped, the display asks the user to ‘ENTER PASSWORD’.
    • Whenever a key is pressed, a 'STAR SYMBOL' appears on display,so nobody gets to know what password is being entered.
  • 16.
    • LCD WORKING
    • When the password entered is correct, the LCD displays ‘ACCESS GRANTED’. Also, the LED next to the relay starts glowing indicating that is on.
    • When the password entered is incorrect, the LCD displays ‘WRONG PASSWORD’. On a wrong password being entered thrice, the buzzer starts ringing.
  • 17. APPLICATIONS:
    • Financial services
    • Affinity programs
    • Cellular phones
    • Set-top boxes
    • Secure network access

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