Final Project Written Report

Final Project Written Report - ENGR 201 Evaluation &...

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ENGR 201 Speedometer Final Project Section - 066 Group Members: Lakir Patel Zach Peters Kia Richards Written by: Lakir Patel, Zach Peters & Kia Richards.     ENGR 201 – 066 Final Project
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Introduction: There are many features that may be desired by a consumer when purchasing a bicycle. The consumer may want a bicycle which keeps track of their heart rate, how many calories were burned or distance traveled. All of these features require an instrument which will collect the data necessary to calculate this information and display it digitally to the rider. This kind of information is particularly crucial to a professional cyclist or an enthusiast who may desire to keep track of his or her velocity to train and thus create endurance. In this project, our design team produces a real time working system that measures a variable from the actual system displays a desired output by the cyclist. The purpose of this experiment is to develop a program using LABVIEW software which will determine a biker’s speed. This will be done by counting the revolutions of the bike’s wheels over a time interval and converting said revolutions into miles per hour. The revolutions of the wheel are detected using a reed switch sensor. The basic reed switch consists of two identical flattened ferromagnetic reeds, sealed in a dry inert-gas atmosphere within a glass capsule, thereby protecting the contact from contamination. The reeds are sealed in the capsule in cantilever form so that their free ends overlap and are separated by a small air gap. 1 An example of a reed switch is illustrated in Figure II. In order for a reed switch to work it must come in contact with a magnetic field that will polarize the overlapping ends of the reeds with opposite charges. These charges attract and the ends of the reeds connect which causes the switch to close. For the purpose of this experiment one revolution of the bike’s wheel is detected 1  (RRE - Reedswitch Reliabilty, 2007) Written by: Lakir Patel, Zach Peters & Kia Richards.     ENGR 201 – 066 Final Project
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each time the reed switch closes. As previously stated the amount of revolutions that the wheel undergoes will be counted over a time interval. This time interval is known as the sampling rate. The sampling rate as defined by Wheeler and Ganji in the text “Introduction to Engineering Experimentation,” is the rate at which measurements are made known and is usually expressed in units of hertz or kilohertz. The measurements are made of a time varying signal using a data acquisition system (NI-USB 6009) at a discrete set of times. 2 This time varying signal is usually represented in a complicated sine wave. Spectral analysis of the sine-wave is performed using the Fourier transform which is the sum of sine and cosine waves at different frequencies. This transform can be done by any modern computer. Abstract:
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This note was uploaded on 12/03/2008 for the course ENGR 201 taught by Professor Miller during the Fall '08 term at Drexel.

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Final Project Written Report - ENGR 201 Evaluation &...

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