Keywords
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IR and Ultrasonic Sensor Network, Microcontroller unit and Space Modeling System |
INTRODUCTION
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Today, the parking issue is becoming a serious for the vehicle owner in most of the cities. Aim of the work is to design automatic parking system which can help common people to park their vehicles in less space and secure environment. Due to dense population in modern era parking space has been one of the major issues whenever certain infrastructure is created. The limited availability of parking space result in traffic congestion, air pollution, fuel and time wastage as well as drivers frustration. The modern and sophisticated parking management system utilizes various technologies to efficiently manage and optimize the space are very useful to solve emerging parking problems. In this research work WSN technologies has attracted and increase attention of the user and are rapidly growing in various fields which expected to provide an efficient and cost effective solution for parking and space management system [3,5]. |
IR and Ultrasonic sensors N/W consists of large number of low cost sensor node which are deployed in the sensing area. They can sensor sample and process the information gathered from the sensing area, and transmit it to local controller to main controller through RF module [2,6]. |
The next part of this paper is to indicate the position of parked and vacant slot. For this purpose IR and Ultrasonic sensors are used. RFID is a very useful technology is used in locking and unlocking of car parking system. It will automatically deduct the amount and open the barricades for parking. The technology requires some extent of cooperation of an RFID reader and an RFID tag. RFID reader is connected to microcontroller in the control office. RFID reader automatically read the information from tag through built in antenna. The received information match with the data base, the control office will send a command to open the barrier [7,20]. |
The main part of this paper is to optimize the un utilize space between two slots.[4,5] The utilization of this work can be depend upon the width of the car, for this purpose installing modern and sophisticated parking management system which is being widely used to provide better parking facilities. This system is very helpful for preventing car thefts in the parking area and also for thorough detection of the vehicles before parked [6]. |
RELATED WORK
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1)Some of the initial studies focused on the applications of car parking system using sensor technologies adopted video sensors/cameras to collect the information in car parking field [1]. However the use of sensors has certain disadvantages, of which the two main disadvantages includes; a video sensor is energetically expensive, and a video sensor generate a very large amount of data which often poses difficulty in transmission in a wireless network. |
2)Bi Yan-Zhong, Sun Li-Min, Zhu Hong-Song and Yan Ting-Xin [2], have designed a system which includes three kinds of nodes and a management station for central control. Each kind of nodes plays a different role in the system, and communicates directly or indirectly with other kinds of nodes. They collaborate with each other to accomplish topology formation, route establishing, parking space status sensing and reporting and command processing. |
3)Wireless Sensor Networks (WSN) has attracted a great amount of attention in recent years [3]. A WSN consists of a large number of low-cost sensor nodes which can be self-organized to set up an ad hoc network via the wireless communication module equipped on the nodes. Taking the advantages of wireless communication and sensing, WSNs have already found many civil and military applications. With the imminent demand of the automobiles and the demand on intelligent parking systems, the use of WSN in these systems has caught the eye of the researchers more so in the last few decades. In this section some of the recent work in this area is presented. |
4)Vanessa W.S. Tang, Yuan Zheng and Jiannong Cao, in their work [4] proposed a WSN-based intelligent car parking system which used wireless sensors deployed into a car park field, with each parking lot equipped with one sensor node, which detects and monitors the occupation of the parking lot. They have implemented a prototype of their system using crossbow motes. The system demonstrated the effectiveness of our design and implementation of the parking system. |
5)Xiaolong Li and Uma Kanth Ranga in their work "Design and Implementation of a Digital Parking Lot Management System” [5], designed a digital vehicle management system using radio frequency identification (RFID) technology. This digital vehicle management system will enhance the utilization of parking space and help user check the availability of the parking space remotely since the system is connected to the Internet. |
6)Nayab Suhail Hamirani, Imdad Ali Ismaili, Asad Ali Shaikh, Faheem Ahmed and Azhar AliShah, in their work, have used ATMEL microcontroller as the main processor along with LCDs and motors as complimentary components for display and rotation [6]. Their model is based on circular mechanism giving low cost, less space and optimum performance. Password locking system is used to verify the object and detects number of free spaces available in the parking lot. |
7)Mingkai Chen and Tianhai Chang, in their work [7] have designed an efficient parking systems using WSN concepts. They used three kinds of nodes namely monitoring nodes, routing nodes and sink node. The monitoring nodes would detect the status of every parking space, and transmit the information through routing nodes hop by hop to the sink node. The sink node connects to the information and management centre through RS-232 interface. After processing the data, the information and management centre will send the message to all the nodes and update the information in LED screen at the entrance of the parking lot. |
8)Rakesh Kumar, Naveen K Chilamkurti and Ben Soh [8], presented a valuable comparison data for different sensors using different type of software functions and hardware components. The main goal of their work was to present a simple, automated analysis and comparison of power management, communication efficiency and threshold times using different sensors and a corresponding prediction of the above features. The results show a clear difference in various parameters by using different types of sensors for vehicle detection. |
A. Hardware Implementations: |
Now a days the parking systems are available to indicates the parking slots but are not model the space of the available slot and it does not indicate the shortest distance of empty parking slot. The main aim of Modern and Sophisticated Parking Management system is to find the nearest slot with the help of IR sensors. This system is required the following necessary hardware [9,10]. |
1] IR Sensors or Infrared TX / RX Module: |
Infrared LED as a transmitter and Photo diode as a receiver both are arrange in a parallel manner. This module is used the detect reflecting cast iron surface and used for obstacle detection. IR LED emits infrared radiation continuously, when vehicle pass on it reflect the infrared light. This reflected light is made incident on reverse bias junction of this photodiode, the electron hole pair are generated, which result in reverse leakage currents. This reverse leakage current pass through resistor so as to get proportional voltage. This current varies accordingly intensity of incident rays. This voltage can be given to OP-AMP comparator compare this voltage with reference voltage and gives digital output in the form of zero and one or on chip ADC in AVR microcontroller to measure this voltage and used in software. The circuit depicts the schematics for an infrared sensor which allows to detect nearest an empty parking slot's from the Modern and Sophisticated parking management system. IR LED emits infrared radiation. These IR sensors which are made on the surface of the floor are used to decide the shortest path to find the empty slot. |
2] Local MCU : |
A group of such sensors units as described above is required to make a line follower vehicle detection system. We generally use 8-10 sensor unit to make line sensor array[19]. Every sensor individually wired with MCU. The output of IR sensors are connected or wired with ATmega324 microcontroller through port A, port B, and port C. The ATmega324 is a new and enhanced version of the ATmega32. In addition to the ATmega32 features, it contains dual USART, two more PWM channels and can run up to 20MHz with 32kB flash, 1024B EPROM, 2048 SRAM with a required power supply 2.7 to 5.5Volt. When the sensors output send request to Local MCU about the nearest path and empty parking slot it will make a proper frame format of the status of the sensors and send it to the main control node MCU. The output of the sensor will transmit wirelessly through RF module to MCUAtmega324. |
3] RF Module: |
There are three types Wireless RF Modules, Transmitter, Receiver and a Transceiver. These RF Modules are designed to serve as a tool for electronic design to perform wireless experiments. The Transmitter, Receiver and Transceiver all have 9600 baud serial interfaces and stand-alone, 3 function switch inputs and outputs. The modules can communicate over distances up to 250 feet. The boards operate on +5V and easily interface to your Basic Stamp 2 or Basic Stamp 2sx, apply +5VDC, ground, and the communication pins you require and enjoy hassle free wireless communications. |
4] Main MCU: |
MCUAtmega324 read each Path sensor one by one and will make a proper frame format $-----status--of--all-- sensors-----#. Status of 24 sensors in the form of 1 and 0. Digit 1 means that there is empty parking slot and 0 means the vehicle is parked. USART 0 and 1 the comparative output signals sends to PC via RS232 protocol. To interface RS232 level signals to MCU we need a "Level converter". What a level converter will do is to convert RS232 level signals (HIGH= -12V LOW= +12V) from PC to TTL level signal (HIGH= +5V, LOW= 0V) to be fed to MCU and also the opposite. As RS232 protocol is such a common protocol there is a dedicated IC designed for this purpose of "Level Conversion". |
5] RFID Module: |
RFID systems comprise three basic elements: a tag, a reader and software. Typically, a reader transmits radio signals that are received by an antenna attached to the tag. The tag sends a unique reply signal back to the reader. Which is then decoded into an identification number. This ID number is unique to the tag. Ideally, a global set of standards will dictate how these ID numbers are assigned and insure that there are no repetitions or duplications. Readers are linked to computers, where identification numbers are matched with specific relevant information. There are also more sophisticated and expensive tags that can stored information in addition to ID numbers directly in the tag. Battery powered tags are called “active tags” [22]. The transponders in automobiles or in parking system used to pay parking charges and operate the locking system when they pass near readers are active RFID tags. Passive tags on other hand, are powered by the signal from the readers. Active tags can be read greater distance than passive tags. |
6] IR Sensors and Motor: |
Each slot is designed for a medium sized vehicle. If a small vehicle enters the slot, then the slot size is reduced by some amount with the help of motor and send request to local controller, for a large vehicle vice versa. This process is repeated for each of the slots[18]. The size of the vehicle is identified by a ultrasonic sensors, with motor arrangement. IC 1392d works on the concept of H-bridge. H-bridge is a circuit which allows the voltage to be flown in either direction. As you know voltage need to change its direction for being able to rotate the motor in clockwise or anticlockwise direction, Hence H-bridge IC are ideal for driving a DC motor. In a single l293d chip there two h-Bridge circuit inside the IC which can rotate two dc motor independently. |
7] Barricades: |
This arrangement used at the entry of the vehicle and at each of the slot. Barricades at the entrance indicate the availability of the slots either small, medium or large. If space is available but not for large vehicle, at that time that hold the vehicle up to the space made available or suggest the driver to use another parking field. Another use of Barricades with RFID module is to pay parking charges and operate the locking and unlocking system. This used to prevent the vehicle from theft. |
8] Display: |
This unit consists of LCD display and arrow like LED array display unit to show the shortest path of the slot. The parking slot availability is display by red and green LED [14]. |
B. Software Implementations: |
1] Architecture of Slots: |
Architecture shows that the arrangement of empty slots and the position of sensors. There are twenty empty slots and thirty six IR sensors that shown in figure [3]. |
2] Space Modelling: |
Each slot is designed for a medium sized vehicle. If a small vehicle enters in the modern sophisticated parking management system then the slot size is reduced by some amount, similarly if a large vehicle enters the slot, the slot size is increased by some amount. This process is repeated for each of the slots [15,16]. The size of the vehicle is identified by a simple IR sensor, with motor arrangement. When slots are empty there is no signal from local controller to main controller. As soon as vehicle enters in each slot, sensors are activated and send signal to local controller and local controller to main controller at the same time sensors at the side barricades get on and start working, the horizontal movement of the sensor given to the local controller where the motor drivers are connected that decides the movement of motor clockwise or anti- clock wise. |
3] Algorithm of space Modelling |
SIMULATION RESULTS
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Figure 8. shows that shows the occupancy of sensors in the system. Which indicates the number of sensors occupied in the system with respect time. |
Fig. no. 2. This graph shows the percentage of total slots occupied in the system with respect time. In this graph we can see that as the time advances the number of occupied slots increase too, but this would not be true always, as when cars would leave the system the graph would indicate a reduction in value thereby showing that the slots are empty in the system. |
This is the most important parameter and is found out after space modelling. In this case we can see that how efficiently the space has been modelled in our system, the higher this index is, the more efficiently space modelling is working in our system. |
CONCLUSION
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This paper introduces modern sophisticated parking management system (MSPMS) based on wireless sensor network, RFID module and MCU. We developed (MSPMS) hardware design with sensor nodes for vehicle parking and to find the nearest slot. MCU with RF module is used to guide the management of parking area and space optimization. MSPMS system is employ advanced technologies to permit efficient use of parking space with optimization. Smart parking ranges from simple systems shows the way of available slots as well as the nearest slots but it is very complex that can model the space. The central coordinator can easily operate the payment token, with the help of this we can prevent vehicle from theft. The management system can monitors the step by step approach of parking scenario. This system will enhance the utilization of parking space and find the shortest distance to park the vehicle and help the user to find the availability of parking space within short period of time. Therefore this system achieves significant role in latest parking and management system. |
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Figures at a glance
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