Department of Electrical and Computer EngineeringBox 9571PSPICEEWB*OscilloscopeC++ CodingPerformance TestEndurance TestIrDA CompliancyXXXXInfrared Keyless Entry Page 1 of 7 Test specification forAutomotive Infrared Keyless Entry SystemSubmitted to:Professor Joseph PiconeECE 4512: Senior Design IDepartments of Electrical and Computer EngineeringMississippi State UniversityMississippi State, Mississippi 39762March 2, 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 4512 March 2, 2001Infrared Keyless Entry Page 2 of 7 EXECUTIVE SUMMARYWireless 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 CPU’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 runoff of power from the vehicle’s battery, and the transmitter will run off of a 6 V battery. 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. ECE 4512 March 2, 2001Infrared Keyless Entry Page 3 of 7 1.INTRODUCTIONThe goal of this project is to design and implement a low cost infrared keyless entry system for a vehicle. By incorporating infrared technology, the system will allow existing communication devices with IrDA compliant ports to interact with the automobile, thus giving the user alternate access to the vehicle. Design approaches will incorporate equipment that will allow circuit simulation, projected waveforms for distance, voltage, and frequency, C++ coding, and overall performance.The design constraints for our project are:1.IrDA Compliancy: We will obtain an infrared transmission speed of 9.6 k/bps. 2. Security Coding: Signals transceived between the units will have to be digitized and encoded in a manner to ensure vehicle security. Third-party devices such as palmtops and PDAs will have specialized software to provide proper encryption and data transmission between the units.3. Range: The transmitter will have a transmission range of no less than 20 feet during normal daylight conditions. 4. Power Supply: The power supplies for the devices will be simulated with circuit simulation software to ensure that the units will consume no more than the specified design requirements.5. IR Signal Transcieving: Viewing angle path of transmission and reception will be no less than 30 degrees. The unit will also be able to transmit signals through the windows of the vehicle. The units must also be tested during normal daylight conditions to ensure that the units will operate outdoors. 6. Endurance Testing: Endurance testing will be necessary to ensure that the receiver will be capable of withstanding the rigors of automobile travel. The transmitter will be required to endure the ruggedness of the external travel and mobility of the driver while out of the vehicle.Testing each of these requirements will ensure that the keyless entry system will operate properly and meet all of the specified design constraints. These design constraints will enable IKE to allow alternate entry to the automobile.ECE 4512 March 2, 2001Infrared Keyless Entry Page 4 of 7 2.TEST SPECIFICATIONSTesting each of the components of our system will be done with a variety of hardware and software tools. Several preliminary tests will be made to ensure that each component of the system works. We will be constructing prototypes of each component to ensure that each component works and interfaces properly to the rest of the system.Constraints PSPICE EWB* Oscilloscope C++CodingPerformanceTestEnduranceTestIrDA Compliancy X X XSecurity Coding XRange X XPower Supply X X XIR SignalTranscievingX X X XImpact Resistance X XTable 1. A summary of the proposed test specifications to evaluate the Infrared Keyless Entry System. *Electronics Workbench2.1 PSpice Pspice software will be used to simulate and develop the power supply. The transceiver circuit will be designed and simulated to operate on a 6 V source. The circuits will also be tested at other various voltage conditions that might occur. Pspice will also be used to test and simulate the circuits of the transmitter and receiver.2.2 Electronic WorkbenchElectronic Workbench software
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