COMP2121 Project Description Inputs
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1. when you service the inputs b Data Structures describing the main data structures used in the system c Algorithms describing how you keep the state of the bridge and vehicles d Module specification describing the functions the input and the output of each module Overall a person with knowledge about the subject and board should understand how your system is designed after reading this design manual Assessment of your project working on the AVR board will also be performed in week 13 Grading The project is worth 15 of your course mark and will be marked under the following criteria which is approximate for now e Implementation 65 o Adherence to specification o Implementation of all input output functionality e Code Style 10 o Easy to read o Well documented e User Manual 10 o Accurately describes set up of board o Correctly describes functionality e Design Manual 15 o Adherence to specification o Readability and Completeness2. COMP2121 Project Semester 2 2009 Due Date 23 October Friday of Week 13 Description The goal of the project is to use the AVR board to simulate a single lane bridge with boom gates The following picture describes the scene The bridge allows an East West road to traverse a river but is narrow and only allows traffic to cross in one direction at a time To ensure adequate traffic flow boom gates have been installed at either end of the bridge to ensure only one direction of traffic has access at any time Boom gate A blocks traffic in the eastbound direction from entering the bridge Boom gate B blocks traffic in the westbound direction from entering the bridge Additionally the bridge has an emergency stop switch to stop both lanes of traffic in case of an accident or if an emergency vehicle needs to use the bridge Inputs Inputs to the system are as follows e Pushing a number on the keypad followed by A or B indicates a number of vehicles that have arrived at the named boom gate e g pushing 4 then A indicates a queue of 4 vehicles arriving at boom gate A e Pushing and holding one of the push buttons indicates the emergency situation The emergency situation remains in place until the button is released Protocol The boom gates and vehicles should operate under the following protocol At startup you may assume no vehicles are in the vicinity of the bridge Whenever there are no vehicles waiti
3. es open closed opening closing The motor will run at 7Orps whenever either gate is opening and at 40rps when either gate is closing Two LEDs should operate as traffic lights red only for the boom gates They will switch off when the boom gate is open indicating traffic may go During an emergency both LEDs will blink at a rate of 2 Hz 2 blinks per second Bonus The following bonus feature can be impemented but is not required to reveive full marks for the project In the case that the emergency button is pushed while a boom gate is opening then the boom gate should properly simulate the amount of time it will take to close E g if the gate had been opening for a quarter of a second it should only take a quarter of a second to close Submission information The following items will be submitted 1 Your source via the subject webpage Your program should be well commented 2 A printed copy of a user manual The user manual describes how a user uses your bridge emulating system including how to wire up the AVR lab board Make sure you indicate which buttons perform each action and how the LED and LCD displays should be interpreted 3 A printed copy of the design manual The design manual describes how you design the single lane bridge emulating system It must contain the following components a System control flow describing the control flow of the system at the module level using a diagram This also shows how and
4. ng at either side of the bridge both boom gates will close If there are vehicles on only one side of the bridge the boom gates will transition to let that direction of traffic through If their boom gate is open vehicles will enter the bridge at a rate of 1 vehicle per second Vehicles take 4 seconds to complete a trip across the bridge To alleviate congestion if one gate has been open for at least 6 seconds and there is a car waiting at the other boom gate then the current boom gate will close and the other boom gate will open A boom gate will not begin opening while there are vehicles still on the bridge travelling in the other direction Boom gates take 1 second to open and 1 second to close Vehicles should not pass while they are opening or closing When the emergency switch is pushed boom gates will start closing immediately However the vehicles already on the bridge will continue as normal In an energency boom gates will remain shut until the push button is released Vehicles can still arrive at either end of the bridge during an emergency Interface The following features must be present in the interface although you are free to add additional information The LCD must be able to display o The number of vehicles waiting on the boom gate A side of the bridge o The number of vehicles waiting on the boom gate B side of the bridge o The number of vehicles currently traversing thebridge o The state of both boom gat
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