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

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Infrared Keyless Entry Page 1 of 33 ECE 4522 December 4, 2001 Design document for Automotive Infrared Keyless Entry System Submitted to: Professor Joseph Picone ECE 4522: Senior Design II Departments of Electrical and Computer Engineering Mississippi State University Mississippi State, Mississippi 39762 December 4, 2001 Submitted by: Adria Jones, Kenny Reynolds, Ray Smith Advisor: Dr. Raymond Winton Department of Electrical and Computer Engineering Mississippi State University Box 9571 Mississippi State, MS 39762 Tel: 662-325-2095, Fax: 662-325-8546 Email: {adj1, rkr1, rgs1} @ece.msstate.eduInfrared Keyless Entry Page 2 of 33 ECE 4522 December 4, 2001 EXECUTIVE SUMMARY Wireless communication has become more and more common throughout the technological world. One form of wireless communication is infrared (IR) data transfer. It has proven to be a very versatile and reliable medium for control and communication devices. It has been used in PC’s for some time and cell phone technology is picking up on the trend as well. We propose to design an Infrared Keyless 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). RFKE systems send signals from the transmitter to the receiver. However, the receiver does not send back a signal informing the user that the signal was received. RF signals are sometimes blocked or interfered with due to a variety of elements as well. RF devices also have to meet certain FCC rules and regulations where IR does not. IR will be a cheap, easy, and efficient means of keyless entry for automobiles. 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, which receives and decodes the signal then performs an operation. So, the IR transmitter and receiver system we plan to design will have to be flexible. There are many requirements that must be met for this project to be a success. The transmitter and the receiver must be small, lightweight, and durable. They must consume as little power as possible and no more than 100mA of current apiece. The receiver will run off of power from the vehicle’s battery, and the transmitter will run off of a 12 V battery source. The range of the IR keyless entry will be 20 feet in normal daylight conditions with a viewing path angle of 30-degrees. To be an efficient design, our project will have to meet all of our stated design objectives. To encode and decode the infrared signals, we will need a micro-controller. The transmitter will send encrypted infrared signals to the receiver. The receiver will then be able to decrypt the signal and perform the operation of opening the door locks on the automobile. Flexibility of IKE can be expanded to allow integration with personal laptops, cell phones, or any other type of IR device. It can also be used to perform various operations on an automobile ranging from rolling down the windows to starting the engine.Infrared Keyless Entry Page 3 of 33 ECE 4522 December 4, 2001 TABLE OF CONTENTS ABSTRACT ................................................................................................. 5 1.INTRODUCTION ...................................................................................... 5 2.PROBLEM STATEMENT ......................................................................... 6 3.OBJECTIVES ........................................................................................... 8 3.1. Functionality .................................................................................... 9 3.2. Unique Signal Keying ...................................................................... 9 3.3. Effective Range ............................................................................... 9 3.4. Power ............................................................................................ 10 3.5. Physical Packaging ....................................................................... 10 3.6. Physical Attributes ......................................................................... 10 3.7. Physical Attributes ......................................................................... 10 3.8. Affordability................................................................................... 11 4.APPROACH ........................................................................................... 11 4.1. Functionality .................................................................................. 11 4.2. Unique Signal Keying .................................................................... 13 4.3. Effective Range ............................................................................. 16 4.4. Power ............................................................................................ 17 4.5. Physical Packaging ....................................................................... 18 4.6. Affordability.................................................................................... 19 4.7 Physical Attributes ......................................................................... 19 5.TEST SPECIFICATION .......................................................................... 20 5.1. Pspice............................................................................................ 21 5.2. Electronic WorkBench ................................................................... 21 5.3. Oscilloscope .................................................................................. 21 5.4. C++ Coding ................................................................................... 21 5.5.. Altera Max Plus II…………………………………………………….. 21 5.6. Performance Test .......................................................................... 22 6.TEST CERTIFICATION .......................................................................... 22 6.1. Functionality .................................................................................. 22 6.2. Unique Signal Keying .................................................................... 25 6.3. Effective Range ............................................................................. 27 6.4.


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

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