Cspass

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Cspass

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

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