One of the vital inventions of mankind is the traffic lights which up to the present are continuously still being modified for a more satisfactory result. Traffic lights are used to control competing flows of traffic and serve as road signals to cars for a smooth and convenient travel. With the aid of the obtained knowledge in logic circuits and digital electronics, a one-way traffic light design was established. The design was initiated by a definite goal which is to make a one-way traffic light mounted to the road intersection with sensors used to detect the presence of vehicles leading to light transitions. After which is the execution of logical operations of the design with the used of Moore model showing how and when the network changes state. The now well established design was then tested on a MULTISIM where the obtained result was analyzed. Modifications were done until the desired output, conforming to the design specifications were attained. Armed with sufficient and efficient technical know-how, the Simple Traffic Light Design was accomplished.
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Abstract
Introduction
Materials and Procedures
Results
Conclusions
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EE 177 Logic Circuits and Digital Electronics
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One-way Road Intersection Traffic Light
A Simple Logic Design
Mindanao State University
College of Engineering
Geraldine T. Casas, 2007-0057 Gayzel P. Dolor, 2008-0056
Mojahid A. Manapa-at, 2008-0296 Mary Rose G. Tabao, 2007-0015
EE 177 Logic Circuits and Digital Electronics MTh 2:30-4:00
1stSemester, AY 2010-2011
August 28, 2011
Engr. Edilberto C. Vergara
Instructor III
i
Table of Contents
Abstract 1
Introduction 1
Design Specification 3
Design Procedure 5
Results 11
Conclusion 12
Appendices
Appendix A. Clock Design Procedure I
Appendix B. Multisim™ Simulations Screenshots V
References VIII
1
Abstract
One of the vital inventions of mankind is the traffic lights which up to the present are
continuously still being modified for a more satisfactory result. Traffic lights are used to control
competing flows of traffic and serve as road signals to cars for a smooth and convenient travel. With the
aid of the obtained knowledge in logic circuits and digital electronics, a one-way traffic light design was
established.
The design was initiated by a definite goal which is to make a one-way traffic light mounted to
the road intersection with sensors used to detect the presence of vehicles leading to light transitions. After
which is the execution of logical operations of the design with the used of Moore model showing how and
when the network changes state. The now well established design was then tested on a MULTISIM where
the obtained result was analyzed. Modifications were done until the desired output, conforming to the
design specifications were attained. Armed with sufficient and efficient technical know-how, the Simple
Traffic Light Design was accomplished.
Introduction
During the horse and buggy days, traffic in big cities was often heavy. With the coming of
automobiles, the situation got even worse. Precisely, traffic on roads take place when a number of
pedestrians, ridden or herded animals, vehicles, streetcars and other conveyances occurs either singly or
simultaneously while using the public way for purposes of travel.
Traffics are hindrance to those who are in a hurry and may also cause accidents. To avoid such
occurrence, traffic lights are adapted for street use. These are signaling devices positioned at road
intersections and other locations to control competing flows of traffic. They alternate the right-of-way of
road users by displaying lights of a standard color. They make use of three colors, each provides distinct
signal that a car must follow. There’s a green light allowing a car to proceed in the direction denoted, a
yellow light denoting prepare to stop short of the intersection, and a red light prohibiting it to proceed.