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ELG4135-Electronics III Professor: Dr. Riadh Habash Presentation date: Nov 28 th , 2006 Group Members: Yichen Fan Gefei

ELG4135-Electronics III Professor: Dr. Riadh Habash Presentation date: Nov 28 th , 2006 Group Members: Yichen Fan Gefei Zhou Zhanglei Song. Infrared Entrance Monitor System. Outline. Introduction System Analysis Simulation Results Further Improvement Conclusion. Introduction.

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ELG4135-Electronics III Professor: Dr. Riadh Habash Presentation date: Nov 28 th , 2006 Group Members: Yichen Fan Gefei

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  1. ELG4135-Electronics IIIProfessor: Dr. Riadh Habash Presentation date: Nov 28th, 2006Group Members:Yichen FanGefei ZhouZhanglei Song Infrared Entrance Monitor System

  2. Outline • Introduction • System Analysis • Simulation Results • Further Improvement • Conclusion

  3. Introduction • We design and implement the basic infrared system • This system can be used in many areas such as: • Door entrance monitoring • Guest/visitor monitoring • Home security • Infrared techniques are widely used in many areas. It has a wavelength of approximately between 750nm and 1mm.

  4. System Description • The infrared systems contains two parts-transmitter part and receiver part. • The transmitter part uses an IR led to radiates the infrared signal. • The receiver part uses an IR receiver module to receive the signal. • The IR led (Light Emitting Diode) is an infrared led which can produces an infrared wave between 750nm to 950nm. • The IR receiver module is an receiving device which can detect an infrared light and produce an inputs to the receiver.

  5. Overview when the beam is on • The transmitter part will generate a modulated signal to the IR (Infrared) led through which it can radiates an infrared signal to the receiver. • The receiver will recognize the radiated signal by the IR (Infrared) receiver module and make an alternative square wave voltage (0 and +5V) as the input of the receiver circuit. This will make the whole circuit works and the LED will be on which means the signal between them is connected well.

  6. Overview when the beam is off • When the IR (Infrared) beam between the transmitter and the receiver is broken, the IR (Infrared) receiver module will recognize there is no more infrared signal and it will produce a constant high voltage (+5V) as the input of the receiver circuit. • This will shut down the whole circuit and the LED will be off which indicates that the beam between the transmitter and the receiver is being blocked.

  7. Transmitter Board

  8. Transmitter description • Square-wave oscillators made by using two 555 timer ICs set up as “astable” multivibrators • Resistors & Capacitors set the IC frequency • Diodes create a “symmetrical” output • IR LED pulsed at 38kHz and transmit the IR beam to receiver

  9. Initialize capacitor discharged Lower comparator sets the FF Charging through R1 Charge time Tc = 0.693 * R1 * C Upper comparator resets the FF Discharging through R2 Discharge time Td = 0.693 * R2 * C Frequency F = 1/(Tc +Td) = 1/(0.693* R1+R2)*C) 555 Timer Description

  10. Simulation • Output of IC1 (250Hz)

  11. Simulation (Cont) • Output of IC2 (38KHz)

  12. Infrared Entrance Monitor Receiver • Block Diagram • Circuit Analysis • Simulation Data Comparison • Improvement

  13. Block Diagram 0-5 5kHz Square wave output Charging capacitor Light ON Receiver IR Beam Detector Relay On Receiver 5V DC output Unable to pass the capacitor Light Off Relay Off

  14. Circuit Analysis

  15. Data Comparison -- XSC1

  16. Data Comparison -- XSC2

  17. Data Comparison – Channel B

  18. Blocked

  19. Data Comparison -- XSC1

  20. Data Comparison -- XSC2

  21. Video of The Simulation Results

  22. Conclusion • We have successfully implemented the circuits in the multisim as well as the hands work. • The simulation meets the theoretical results and also it meets the results implemented from the hands work. • The design can be used for commercial purpose.

  23. Further Improvement for our circuit • Add a counter to the relay to counts the number of people entering the shop or the number of cars entering the entrance. • Change the values of capacitors or the input voltage to make the discharging time shorter or longer depends on what we need.

  24. References • Iguana Labs, “Oscillators, Pulse Generators, Capacitors and the 555 Timer IC”, http://www.iguanalabs.com/555kit.htm, August 6th, 2004 • John Hewes, “Relays”, http://www.kpsec.freeuk.com/components/relay.htm, 2006 • Wikipedia, the free encyclopedia, “Counter”,http://en.wikipedia.org/wiki/Counter, 31 October 2006 • Data sheet, http://pdf1.alldatasheet.com/datasheet-pdf/view/5642/MOTOROLA/SN74LS107D.html, 2006

  25. Thank you very much Especially thank you for the Professor Habash and the TAs who helping us a lot on the project. Questions and Concerns?

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