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MSU ECE 4522 - Design document for Automotive Infrared Keyless Entry System

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Department of Electrical and Computer EngineeringBox 9571Tel: 662-325-2095, Fax: 662-325-8546ABSTRACT 5ABSTRACTEND OF FILEEND OF FILEInfrared Keyless Entry Page 1 of 33 Design document forAutomotive Infrared Keyless Entry SystemSubmitted to:Professor Joseph PiconeECE 4522: Senior Design IIDepartments of Electrical and Computer EngineeringMississippi State UniversityMississippi State, Mississippi 39762December 4, 2001Submitted by:Adria Jones, Kenny Reynolds, Ray SmithAdvisor: Dr. Raymond WintonDepartment of Electrical and Computer EngineeringMississippi State UniversityBox 9571Mississippi State, MS 39762Tel: 662-325-2095, Fax: 662-325-8546Email: {adj1, rkr1, rgs1} @ece.msstate.eduECE 4522 December 4, 2001Infrared Keyless Entry Page 2 of 33 EXECUTIVE SUMMARYWireless communication has become more and more common throughout thetechnological world. One form of wireless communication is infrared (IR) datatransfer. It has proven to be a very versatile and reliable medium for control andcommunication devices. It has been used in PC’s for some time and cell phonetechnology is picking up on the trend as well. We propose to design an InfraredKeyless Entry system (IKE) for automobiles. Automotive companies have used infrared keyless entry in the past few years.However, the majority of cars use Radio Frequency Keyless Entry (RFKE). RFKEsystems send signals from the transmitter to the receiver. However, the receiverdoes not send back a signal informing the user that the signal was received. RFsignals are sometimes blocked or interfered with due to a variety of elements aswell. RF devices also have to meet certain FCC rules and regulations where IRdoes not. IR will be a cheap, easy, and efficient means of keyless entry forautomobiles. IR technology is very versatile. With IR, consumers can communicate by laptop,cell phone, palm tops, etc. The IKE system we will design will consist of two parts:the transmitter, which creates and sends the encoded signal, and the receiver, whichreceives and decodes the signal then performs an operation. So, the IR transmitterand receiver system we plan to design will have to be flexible. There are manyrequirements that must be met for this project to be a success. The transmitter andthe receiver must be small, lightweight, and durable. They must consume as littlepower as possible and no more than 100mA of current apiece. The receiver will runoff of power from the vehicle’s battery, and the transmitter will run off of a 12 Vbattery source. The range of the IR keyless entry will be 20 feet in normal daylightconditions with a viewing path angle of 30-degrees. To be an efficient design, ourproject will have to meet all of our stated design objectives.To encode and decode the infrared signals, we will need a micro-controller. Thetransmitter will send encrypted infrared signals to the receiver. The receiver willthen be able to decrypt the signal and perform the operation of opening the doorlocks on the automobile.Flexibility of IKE can be expanded to allow integration with personal laptops, cellphones, or any other type of IR device. It can also be used to perform variousoperations on an automobile ranging from rolling down the windows to starting theengine. ECE 4522 December 4, 2001Infrared Keyless Entry Page 3 of 33 TABLE OF CONTENTSABSTRACT...................................................................................................5 1.INTRODUCTION.........................................................................................52.PROBLEM STATEMENT............................................................................63.OBJECTIVES..............................................................................................83.1. Functionality.......................................................................................93.2. Unique Signal Keying........................................................................93.3. Effective Range..................................................................................93.4. Power..............................................................................................10 3.5. Physical Packaging..........................................................................103.6. Physical Attributes...........................................................................103.7. Physical Attributes...........................................................................103.8. Affordability..................................................................................... 114.APPROACH..............................................................................................114.1. Functionality.....................................................................................114.2. Unique Signal Keying......................................................................134.3. Effective Range................................................................................164.4. Power...............................................................................................174.5. Physical Packaging..........................................................................184.6. Affordability......................................................................................194.7 Physical Attributes...........................................................................195.TEST SPECIFICATION............................................................................205.1. Pspice..............................................................................................215.2. Electronic WorkBench.....................................................................215.3. Oscilloscope....................................................................................215.4. C++ Coding......................................................................................215.5.. Altera Max Plus II…………………………………………………….. 215.6. Performance Test.............................................................................226.TEST CERTIFICATION............................................................................226.1. Functionality.....................................................................................226.2. Unique Signal Keying......................................................................256.3. Effective


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MSU ECE 4522 - Design document for Automotive Infrared Keyless Entry System

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