ELG4135-Electronics III Professor: Dr. Riadh Habash Presentation date: Nov 28 th, 2006 Group...
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Transcript of ELG4135-Electronics III Professor: Dr. Riadh Habash Presentation date: Nov 28 th, 2006 Group...
ELG4135-Electronics IIIELG4135-Electronics IIIProfessor: Dr. Riadh Habash Professor: Dr. Riadh Habash
Presentation date: Nov 28Presentation date: Nov 28thth, 2006, 2006
Group Members:Group Members:
Yichen FanYichen FanGefei ZhouGefei Zhou
Zhanglei SongZhanglei Song
Infrared Entrance Monitor SystemInfrared Entrance Monitor System
OutlineOutline
IntroductionIntroduction System AnalysisSystem Analysis Simulation ResultsSimulation Results Further ImprovementFurther Improvement ConclusionConclusion
IntroductionIntroduction We design and implement the basic infrared systemWe design and implement the basic infrared system This system can be used in many areas such as:This system can be used in many areas such as:
Door entrance monitoring Door entrance monitoring Guest/visitor monitoring Guest/visitor monitoring Home security Home security
Infrared techniques are widely used in many areas. It Infrared techniques are widely used in many areas. It has a wavelength of approximately between 750nm and has a wavelength of approximately between 750nm and 1mm. 1mm.
System DescriptionSystem Description
The infrared systems contains two parts-transmitter part The infrared systems contains two parts-transmitter part and receiver part.and receiver part.
The transmitter part uses an IR led to radiates the infrared The transmitter part uses an IR led to radiates the infrared signal.signal.
The receiver part uses an IR receiver module to receive the The receiver part uses an IR receiver module to receive the signal.signal.
The IR led (Light Emitting Diode) is an infrared led which The IR led (Light Emitting Diode) is an infrared led which can produces an infrared wave between 750nm to can produces an infrared wave between 750nm to 950nm.950nm.
The IR receiver module is an receiving device which can The IR receiver module is an receiving device which can detect an infrared light and produce an inputs to the detect an infrared light and produce an inputs to the receiver.receiver.
Overview when the beam is onOverview when the beam is on
The transmitter part will generate a modulated signal to The transmitter part will generate a modulated signal to the IR (Infrared) led through which it can radiates an the IR (Infrared) led through which it can radiates an infrared signal to the receiver.infrared signal to the receiver.
The receiver will recognize the radiated signal by the IR The receiver will recognize the radiated signal by the IR (Infrared) receiver module and make an alternative (Infrared) receiver module and make an alternative square wave voltage (0 and +5V) as the input of the square wave voltage (0 and +5V) as the input of the receiver circuit. This will make the whole circuit works receiver circuit. This will make the whole circuit works and the LED will be on which means the signal between and the LED will be on which means the signal between them is connected well.them is connected well.
Overview when the beam is offOverview when the beam is off
When the IR (Infrared) beam between the transmitter When the IR (Infrared) beam between the transmitter and the receiver is broken, the IR (Infrared) receiver and the receiver is broken, the IR (Infrared) receiver module will recognize there is no more infrared signal module will recognize there is no more infrared signal and it will produce a constant high voltage (+5V) as the and it will produce a constant high voltage (+5V) as the input of the receiver circuit.input of the receiver circuit.
This will shut down the whole circuit and the LED will be This will shut down the whole circuit and the LED will be off which indicates that the beam between the off which indicates that the beam between the transmitter and the receiver is being blocked. transmitter and the receiver is being blocked.
Square-wave oscillators Square-wave oscillators made by using two 555 timer ICs set up as “astable” multivibrators made by using two 555 timer ICs set up as “astable” multivibrators
Resistors & CapacitorsResistors & Capacitors set the IC frequency set the IC frequency
DiodesDiodes create a “symmetrical” output create a “symmetrical” output
IR LEDIR LED pulsed at 38kHz and transmit the IR beam to receiver pulsed at 38kHz and transmit the IR beam to receiver
Transmitter descriptionTransmitter description
555 Timer Description555 Timer Description Initialize capacitor discharged Initialize capacitor discharged Lower comparator sets the FFLower comparator sets the FF Charging through R1Charging through R1 Charge timeCharge time
Tc = 0.693 * R1 * CTc = 0.693 * R1 * C Upper comparator resets the Upper comparator resets the
FFFF Discharging through R2Discharging through R2 Discharge timeDischarge time
Td = 0.693 * R2 * CTd = 0.693 * R2 * C FrequencyFrequency F = 1/(Tc +Td) = 1/(0.693* R1+R2)*C)F = 1/(Tc +Td) = 1/(0.693* R1+R2)*C)
Infrared Entrance Monitor Infrared Entrance Monitor ReceiverReceiver
Block DiagramBlock Diagram Circuit AnalysisCircuit Analysis Simulation Data ComparisonSimulation Data Comparison ImprovementImprovement
Block DiagramBlock Diagram
IR Beam Detector
Receiver
0-5 5kHz Square wave output
Charging capacitor
Light ON
Receiver 5V DC output Unable to pass the capacitor Light Off
Relay Off
Relay On
ConclusionConclusion
We have successfully implemented the circuits We have successfully implemented the circuits in the multisim as well as the hands work.in the multisim as well as the hands work.
The simulation meets the theoretical results and The simulation meets the theoretical results and also it meets the results implemented from the also it meets the results implemented from the hands work.hands work.
The design can be used for commercial The design can be used for commercial purpose.purpose.
Further Improvement for our circuitFurther Improvement for our circuit
Add a counter to the relay to counts the Add a counter to the relay to counts the number of people entering the shop or the number of people entering the shop or the number of cars entering the entrance.number of cars entering the entrance.
Change the values of capacitors or the Change the values of capacitors or the input voltage to make the discharging time input voltage to make the discharging time shorter or longer depends on what we shorter or longer depends on what we need.need.
ReferencesReferences
Iguana Labs, “Oscillators, Pulse Generators, Capacitors and the Iguana Labs, “Oscillators, Pulse Generators, Capacitors and the 555 Timer IC”, 555 Timer IC”, http://www.iguanalabs.com/555kit.htmhttp://www.iguanalabs.com/555kit.htm, August 6, August 6thth, , 20042004
John Hewes, “Relays”, John Hewes, “Relays”, http://www.kpsec.freeuk.com/components/relay.htmhttp://www.kpsec.freeuk.com/components/relay.htm, 2006, 2006
Wikipedia, the free encyclopedia, “Counter”,Wikipedia, the free encyclopedia, “Counter”, http://en.wikipedia.org/wiki/Counterhttp://en.wikipedia.org/wiki/Counter, 31 October 2006 , 31 October 2006
Data sheet, Data sheet, http://pdf1.alldatasheet.com/datasheet-pdf/view/5642/MOTOROLA/http://pdf1.alldatasheet.com/datasheet-pdf/view/5642/MOTOROLA/SN74LS107D.htmlSN74LS107D.html, 2006, 2006