Homework SourseConsider the above diagram FIGURE of the car park The object
Solution
International Journal of Scientific and Research Publications, Volume 2, Issue 10, October 2012 1 ISSN 2250-3153
ITS IMPLEMENTED IN THIS PAPER ,PLEASE GO THROUGH IT.
Abstract- Recently, with the rapid development of micro electronics technology, wireless communication technology and embedded system, the technology of wireless sensor network (WSN) has been advanced a lot. At the meanwhile, more and more producers and international organizers want to make the mote more intelligent and standard. Sensor Networks being considered as an emerging area of research in recent years has evolved in itself a large potential to counteract the ongoing system. By networking large numbers of tiny sensor motes, it is possible to obtain data about physical phenomena that was difficult or even sometimes impossible to obtain in conventional ways. Automatic multi-stored car parking system is very good substitute for car parking area. Since in modern world, where space has become a very big problem and in the era of miniaturization its become a very crucial necessity to avoid the wastage of space in modern, big companies and apartments etc. For example, in a space where more than 100 cars need to be parked, it’s a very difficult task to do and also to reduce the wastage of area, this system can be used. This Automatic Car Parking enables the parking of vehicles-floor after floor and thus reducing the space used. Here any number of cars can be park according to requirement. These make the system modernized and even a space-saving one. This idea is developed using AVR Microcontroller. Here program is written according to this idea using AVR ATMEGA 16 microcontroller. This Automatic Car Parking enables the parking of vehicles-floor after floor and thus reducing the space used. Here any number of cars can be park according to requirement. These make the system modernized and evens a space-saving one. This idea is developed using AVR Microcontroller. Here program is written according to this idea using AVR ATMEGA 16 microcontroller. Mathematical modeling is also done to identify the least car parking space available among the difference parking places in a city. The car parking system is already developed with the 8051 microcontroller, we have implemented multistory car parking using AVR ATMEGA 16 microcontroller with Zigbee wireless transceiver module. Index Terms- Alfa Vizad RISC (AVR) Microcontroller, Institute of Electrical and Electronics Engineering (IEEE), ZigBee module, Wireless sensor networks (WSN), Wireless personal area Network (WPAN). I. INTRODUCTION ith the rapid proliferation of vehicle availability and usage in recent years, finding a vacant car parking space is becoming more and more difficult, resulting in a number of practical conflicts. Parking problems are becoming ubiquitous and ever growing at an alarming rate in every major city. Wide usage of wireless technologies with the recent advances in wireless applications for parking, manifests that digital data dissemination could be the key to solve emerging parking problems. Wireless Sensor Network (WSN) technologies have attracted increased attention and are rapidly emerging due to their enormous application potential in diverse fields [4]. This field is expected to provide an efficient and cost-effective solution to the effluent car parking problems. This paper proposes a Smart Parking System based on wireless sensor network technology which provides advanced features like automated guidance. The paper describes the overall system architecture of our embedded system from hardware to software implementation in the view point of sensor networks. This paper also shows that the pre existing security surveillance (CCTVs) will be used as a sensing nodes to identify vacant parking space. The captured image will be processed through the AVR Microcontroller and the processed data will be transmitted via ZigBee to a central computer to store and update the occupancy status of available parking space vacancies in the database. The performance of this WSN based system can effectively satisfy the needs and requirements of existing parking hassles thereby minimizing the time consumed to find vacant parking lot, real time information rendering, and smart reservation mechanisms. ZigBee [1,2] defines the higher layer communication protocols built on the IEEE 802.15.4 standards for LR-PANs. ZigBee is a simple, low cost, and low power wireless communication technology used in embedded applications. ZigBee devices can form mesh networks connecting hundreds to thousands of devices together. ZigBee devices use very little power and can operate on a cell battery for many years. There are three types of ZigBee devices: Zig Bee coordinator, ZigBee router, and ZigBee end device. Zig-Bee coordinator initiates network formation, stores information, and can bridge networks together. ZigBee routers link groups of devices together and provide multi hop communication across devices. ZigBee end device consists of the sensors, actuators, and controllers that collects data and
communicates only with the router or the coordinator. The ZigBee [3] standard is publicly available from June2005. 2.1.1 IEEE 802.15.4 Protocol. Figure 1: ZigBee Stack Layer [9] The IEEE 802.15.4 is a part of the IEEE family of standards for the physical and link layers for Wireless Personal Area Networks (WPANs). The main focus of IEEE 802.15.4 is low data rate WPANs, with low complexity and low power consumption requirements. IEEE 802.15.4 uses device classification to reduce the complexity of the nodes. The standard classifies two types of devices to reduce complexity, a full function device (FFD) and a reduced function device (RFD). The RFD can only communicate with FFDs, but the FFD can communicate with both FFDs and RFDs. The IEEE 802.15.4 supports two Physical Layer (PHY) options. The 868/915MHz PHY known as low-band uses binary phase shift keying (BPSK) modulation whereas the 2.4 GHz PHY (high band) uses Offset Quadrature Phase Shift Keying (O-QPSK) modulation. The ZigBee network layer stack sits on top of IEEE 802.15.4 standard Medium Access Control (MAC) and PHY layers (refer to figure 1). The MAC and PHY layers contain the RF and communication components that communicate with other devices. The ZigBee stack contains the networking layer, an application support sub-layer and a security service provider (SSP) [8]. II. OLD CAR PARKING SYTEM Old car parking system [18] was developed using 8051 microcontroller. It has the sections: Display section, Keyboard, indicator & Beeper section, Lift & motor section, Sensor section, LCD section. Program is written using 8051 microcontroller. Two 8255 IC\'s are connected to 8051. All circuits are interfaced with 8255. The display section displays the floor number along with the number of cars which has been already parked in that particular floor. So whenever a car is ready to either come down or go up, the program either decrements the count or increments the count automatically according to the going up or coming down of a car. Display section is done by interfacing with 8255(PPI) of 8051.Here 3 ports of 8255 are connected to three 7- segment display. Block diagram of this section is shown. 12 switches are connected in matrix form and it has three LED’s, RED, GREEN &YELLOW. The person, needed to enter the password has to wait until the GREEN LED glows and when it glows, he has to press the “START” button first. This time the RED LED glows. Then the person has to enter the password. As soon as it is entered, the program checks it with the already stored passwords. If it is correct, YELLOW LED glows. Figure 2 Car Parking System using 8051 Microcontroller If the entered password is wrong, beeper starts beeping signifying the incorrectness of the password entered. The indicator section contains 2 LED’s, RED & GREEN which are present in all the floors. RED LED signifies that the lift is presently busy and shall not entertain any car to enter but if GREEN LED glows, it suggests that the lift is ready and the car can enter the particular floor. Beeper and LED\'s are connected to port C upper of 8255. One more advantage of beeper is that; when a person tries to enter the lift irrespective of finding the display section to be FFF (means the floors are already filled), program sends a signal to Beeper section and it starts beeping indicating that he is not supposed to enter the lift since all the floors are already filled. In lift and motor section, there is a light beam and LDR to know whether a car has entered the lift or not. When the GREEN LED of indicator section glows, that means the lift is ready for the car to enter. When the car enters the lift, the light beam falls on LDR present in the lift gets cut and it gives a signal that a car has entered the lift. Then program decides which floor lift has to go and gives a signal to motor section. The motor section is a mechanical part of the model which is used for taking the lift up/down. When the lift has to go up, program gives the signal and the motor rotates clockwise and if it has to go down, it rotates anticlockwise. First 4 pins port A is connected to motor. Power transistors must be connected to drive the motor. Circuit diagram of this section is shown bellow. Sensor section contains LDR\'s .These LDR\'s are connected to each floor to give information if any car has to come down. When a person needs to come down from a particular floor to ground floor, he is expected to focus the headlight the car onto the LDR placed in that floor. When light
falls on LDR its resistance decreases. Hence IC 555 triggers and gives a signal. Program identifies that signal and gives a signal to motor section. III. IMPLEMENTATION OF PARKING SYTEM USING ATMEGA 16 The implementation of automatic car parking system is shown in figure 3 which consists of the following parts. Figure 3 Automatic car parking system ATMEGA-16 Microcontroller, LCD for Display system, Digital Sensors, Transmitter section, receiver section, Power supply management system. Power supply management system provides the 5V supply to the microcontroller. Digital sensor senses the cars and displays the corresponding floor information on the LCD display. Here are two LCD displays, one is for transmitter section and another is for receiver section. A display is provided at the ground floor which is basically a counter that displays number of cars in each floor. It informs whether the floors are fully filled with the cars or is it having place in a particular floor or not. There is facility of lift to carry the car to up and down. Movement of Lift is controlled by dc motor. In this project we have provided three floors of a building for car parking. Maximum storage capacity of each floor is given as ten. Storage capacity can be changed according to the requirement. When the lift reaches the first floor, the processor compares the filled amount to that of the already fed capacity of that floor, and if it finds that the first floor is fully filled, it goes to the second floor and thus the procedure stops here. As soon as a car is placed in a particular floor, the display counter at the ground floor increments as to indicate the floor capacity has decreased by one. After the lift places the car in a particular floor, it comes back to its normal position and that time, the motor that drives it, also stops. IV. IMPLEMENTATION SCENERIOS We have implemented the car parking for Ground floor to third floor. In the diagram the IR sensor is place by switch, 16 2 LCD display is used to display the information for Transmitter as well as Receiver. A lift mechanism is used in the implementation. If the status of Ground floor is full then lift moves towards first floor and returns to ground. Similarly if the first, second floors are full lift moves upward and returns to ground. A DC Motor is used for lift mechanism. ATMEGA 16 Microcontrollers works on the 5 V Power supply and dc motor works on 9 V. So, motor driver IC L 293 D is used to drive the motor and interfaced with ATMEGA 16 microcontroller. Case1: Ground Floor car parking using one IR sensor, it can sense the status of Ground floor only it has the limitations to park the car on GND. If IR Sensor =1, Car parking is full and IR Sensor = 0 car parking has “VACANT SPACE”. Figure 4 Car parking for ground floor Case 2: If the Ground floor is full, A lift mechanism is used to park the car on first floor which is implemented using motor as in the simulation diagram. If it rotates in clock wise direction means the lift is moving upward, if it rotates in anticlockwise direction, it means lift rotates in downward direction. Two IR sensors are used in this IR1 for ground floor and IR2 for First Floor.
Case 3: If the Ground floor is full, similar lift mechanism is used to park the car on first floor and second floor which is implemented using motor as in the simulation diagram. If it rotates in clock wise direction means the lift is moving upward, if it rotates in anticlockwise direction, it means lift rotates in downward direction. Three IR sensors are used in this IR1 for ground floor and IR2 for First Floor and IR 3.
Case 4: If the Ground floor is full, similar lift mechanism is used to park the car on first floor an, second floor and third floor which is implemented using motor as in the simulation diagram. If it rotates in clock wise direction means the lift is moving upward, if it rotates in anticlockwise direction, it means lift rotates in downward direction. Three IR sensors are used in this IR1 for ground floor and IR2 for First Floor, IR 3 for second floor and IR4 for third floor.
ferent buildings named as parking 1, parking 2, parking 3, and
parking 4. All parking are using gyro having the coordinates (x1,
y1, z1) for parking 1, (x2, y2, z2) for parking 2, (x3, y3, z3) for
parking 3, and (x4, y4, z4) for parking 4. Gyro is giving the
coordinates. Gyros are connected in all parking entrance and
inside car also. Gyro connected inside car having the
coordinate(x5, y5, z5).
A switch mechanism is inserted in the car because the car
will pass by many paths and it will take many coordinates as
garbage values. When this switch will on inside the car,
coordinates of car will be generated using gyro 5 (x5, y5, z5). If
the switch is not pressed, the car will not get any information
because switch is programmed for fixed coordinates only. We
will program the switch for car parking coordinates (x1, y1, z1)
for parking 1, (x2, y2, z2) for parking 2, (x3, y3, z3) for parking 3,
and (x4, y4, z4) for parking 4, so that it will accept the information
for those parking spaces only. As the coordinates of gyro 5 will
match to the coordinates of any gyro 1, gyro 2, gyro 3, gyro 4,
the information will display in the car about that particular
parking area. Let P1, P2, P3, P4 and P5 is the data received in
gyro 1, gyro 2, gyro 3, gyro 4 and gyro 5. Data received i.e.
coordinates of all parking P1 = Gyro 1, P2 = Gyro 2, P3 = Gyro
3, P4 = Gyro 4 and P5 = Gyro 5. Now calculate the distance from
P1, P2, P3, and P4 from P5. Calculating the distance from all
parking area using formula
D =
and display in car. Compare distances from all parking area,
which is the shortest distance will display in our car
Figure 8 Algorithm of least parking space
Let us consider
d1 = Distance of car from parking 1 or distance between gyro 1
and gyro 5
d2 = Distance of car from parking 2 or distance between gyro 2
and gyro 5
d3 = Distance of car from parking 3 or distance between gyro 3
and gyro 5
d4 = Distance of car from parking 4 or distance between gyro 4
and gyro 5
We are using gyro which is giving the coordinates, gyros are
connected in all parking entrance and inside car also
P1 = Gyro 1 = (x1, y1, z1),
// Coordinates of parking 1 from gyro in car
P2 = Gyro 2 = (x2, y2, z2),
// Coordinates of parking 2 from gyro in car
P3 = Gyro 3 = (x3, y3, z3),
// Coordinates of parking 3 from gyro in car
P4 = Gyro 4 = (x4, y4, z4) and
// Coordinates of parking 4 from gyro in car
P5 = Gyro 5 = (x5, y5, z5)
// Coordinates of gyro in car
If (switch pressed)
{
USART read ( ) ;
// USART in microcontroller is receiving the data i.e coordinates
of all parking area
// distance of car from parking 1
// distance of car from parking 2
International Journal of Scientific and Research Publications, Volume 2, Issue 10, October 2012 6
ISSN 2250-3153
www.ijsrp.org
// distance of car from parking 3
// distance of car from parking 4
{
}
}
The proposed algorithm is for finding the information of shortest
car parking available in our city.
VI. SOFTWARE DEVELOPMENT
Microcontroller, when it is used to operate as a wireless
network involves following steps [10]
Figure 9 Steps for software development [10]
(1) Coding / Debugging- Coding or debugging is one in a
high-level language (such as c or java). Compiler for a high-level
language helps to reduce production time. To program the
microcontrollers Win AVR [11] was used using C language. The
source code has been commented to facilitate any occasional
future improvement and maintenance. Win AVR is a suite of
executable, open source software development tools for the
Atmel AVR series of RISC microprocessors hosted on the
Windows platform. It includes the GNU GCC compiler for C and
C++. Win AVR contains all the tools for developing on the
AVR. This includes AVR-gcc (compiler), AVR-gdb (debugger)
etc.
(2) Compiling- After compiling the program, it is
converted to machine level language in the form of o’s
ans1’s.This file is called as the Hex file and is saved with the
extension (.Hex). The compiler also generates errors in the
program which should be removed for proper execution of the
program.
(3) Burning- Burning the machine language (hex) file into
the microcontroller’s program memory is achieved with a
dedicated programmer, which attaches to a PC’s peripheral. PC’s
serial port has been used for the purpose. For this purpose
Ponyprog programmer was used to burn the machine language
file into the microcontroller’s program memory. Ponyprog is
serial device programmer software with a user-friendly GUI
framework available for Windows95/98/ME/NT/2000/XP and
Intel Linux. Its purpose is reading and writing every serial
device. It supports I²C Bus, Micro wire, SPI EEPROM, and the
Atmel AVR and Microchip PIC microcontroller. The
microcontrollers were programmed in approximately two
seconds with a high speed-programming mode. The program
memory, which is of Flash type, has, just like the EEPROM, a
limited lifespan. On AVR microcontroller family it may be
reprogrammed up to a thousand times without any risk of data
corruption Atmega16 Programmer (ISP) which is used to burn
the program into AVR microcontrollers.
(4) Evaluation-If the system performs as desired by the
user and performs all the tasks efficiently and effectively the
software development phase is over and the project is ready to be
installed in any of the industrial sites as a personal area network.
If not, the entire process is repeated again to rectify the errors.
One of the difficulties of programming microcontrollers is the
limited amount of resources the programmer has to deal with. In
PCs resources such as RAM and processing speed are basically
limitless when compared to microcontrollers. In contrast to a PC,
the code on microcontrollers should be as low on resources as
possible, but being cost effective and power efficient makes it a
better option. In the programming of the proposed system is used
the following .c and .h file
(1) lcd.c -This c file contains the code for control of
functionality of the attached LCD module. The code controls the
initialization of the LCD, data writing on the LCD, and also the
movement, characteristics and location of the cursor. It offers the
facility to write data on the LCD character-by-character or stringwise.
The command set used in the software is based on the
command set used in the LCD based on Hitachi HD44780 ICs.
This file contain InitLCD ( ),
LCDClear ( ), LCDWriteString ( ) and LCDWriteInit ( ).
(2) lcd.h- This header file contains all the constant
variable values and names of the subroutines used by various
files used in the software. It clearly indicates which variable can
be used as a global variable and which of the subroutines can be
used across the software files.
VII. COMPARISION
In our implemenation we have used the AVR ATMEGA 16
microcontroller which has the more advantages in comparision to
8051. By the survey of ATMEGA 16 it has been proved that it is
the best controller for interfacing . There is added an EEPROM
to store data over a power off time. In 8051 it is not there. An
internal oscillator and an internal power on reset make the AVR
working without any other components , we can extend the
frequency from (1 MHz to 25 MHz) by external crystals but in
8051 microcontroller crystal frequency is fixed (11.0592 MHz)
A watchdog to handle hanging software states is added. This is
not usable for electrical influence, since it must enable after reset
International Journal of Scientific and Research Publications, Volume 2, Issue 10, October 2012 7
ISSN 2250-3153
www.ijsrp.org
and can be disabled. For this task it must be enable by
programming a fuse and not be disable. .The divider between
XTAL and cycle time is reduced from 12 to one. So the
instruction time is many times faster than the 8051.e.g. you can
realize an I2C-interface fully in software without reduced clock
speed (at fully 100 kHz). In 8051, the data transfer rate after
9600 kbps baud rate is very slow and in AVR microcontrollers it
is faster than 10 times. In 8051 if the program size is larger than
1 Kb, then there will be the problem to debug in real time
environment. In AVR there is no limit of program, hence it has
been proved the best controller for real time interfacing in real
time operating systems (RTOS).
Automatic car parking systems developed using 8051
microcontrollers are using extra peripherals such as keyboard,
indicator, siren, LDR. Whenever we are designing any electronic
system then Area, speed, power consumption and cost are the
main parameters. In our design, based on AVR microcontroller
we can optimize the hardware and power consumption. The data
transmission rate is high in comparison to 8051 microcontroller
based system, and then system performance will increase. AVR
is the best controller to interface with various wireless
technologies (GSM, Wifi, Bluetooth, Zigbee e.t.c) because we
can achieve the higher baud rate with this controller. UBRR
(UART bit rate recorder and % error) is shown in the figure 10.
This data is taken from AVR data sheet and
http://www.wormfood.net/avrbaudcalc.php.
Table 4: Baud rate of ATMEGA 16 with % error
20 MHz
Baud Rate UBRR % of error
300 4166 0.0
600 2082 0.0
1200 1041 0.0
2400 520 0.0
4800 259 0.2
9600 129 0.2
14400 86 0.2
19200 64 0.2
28800 42 0.9
38400 32 1.4
57600 21 1.4
76800 15 1.7
115200 10 1.4
Table 5 baud rate for 8051 Microcontroller
11.0592 Mhz
Baud Rate UBRR % of error
300 570 0.0
600 282 0.1
1200 205 0.1
2400 180 0.0
4800 119 0.2
Figure 10 Comparison of performance of ATMEGA 16 and
8051 microcontroller in automatic car parking in terms
UBBR (UART bit rate receiver)
Our Parking system is best suited to find out the nearest
parking area among many parking places available in a city. We
have used gyro mechanism in our parking system, which shows
the nearest distance to park. A switch mechanism is inserted in
the car because the car will pass by many paths and it will take
many coordinates as garbage values. When this switch will on
inside the car, coordinates of car will be generated using gyro
inside the car. If the switch is not pressed, the car will not get any
information because switch is programmed for fixed coordinates
only. We could implement this system with 8051 microcontroller
also but to achieve the good data transmission rate at least 9600
kbps baud rate is required, to achieve this baud rate the crystal
frequency should be 20 MHz, which is fixed in 8051
microcontroller (XTAL = 11.0592 MHz).
VIII. CONCLUSION & FUTURE SCOPE
Automatic multi-stored car parking system is very good
substitute for car parking area. Since in modern world, where
space has become a very big problem and in the era of
miniaturization its become a very crucial necessity to avoid the
wastage of space in modern, big companies and apartments etc.
In space where more than 100 cars need to be parked, it’s a very
difficult task to do and also to reduce the wastage of area, this
system can be used. This Automatic Car Parking enables the
parking of vehicles-floor after floor and thus reducing the space
used. Wireless car parking system implementation is really very
challenging; we have implemented our system of car parking
upto three floors. Zigbee transceiver module is used as wireless
International Journal of Scientific and Research Publications, Volume 2, Issue 10, October 2012 8
ISSN 2250-3153
www.ijsrp.org
technology and the implementation of such system we have
following advantages.
Parking Space Monitoring: Monitoring Parking space
from a remote location and controlling of pumps can be done.
Better Utilization of space available: parking space better
utilization efficiency saves time and more no of vehicles can be
parked simultaneously.
Security Gates: Since through a specific access codes we
could utilize the parking for a registered users. Deployment of a
security barrier or tyre puncture strip if gate is breached.
For over 25 years, Remote Control Technology has been a
leader in innovative applications of wireless Radio Frequency
(RF) remote control and telemetry devices. These Technologies
is continually expanding its product offerings and services to
meet emerging customer needs, and its implementation using
wireless modules is the next future which will be implemented in
malls, buildings and cities.
REFERENCES
[1] ZigBee: Wireless control that simply works http://www.zigbee.org page (pp
1-15)
[2] Zig Bee Standards Overview, <http: // www. freescale.com/ web app /sps
/site/ overview.jsp? nodeI d= 01J4Fs25657725. (pp 12-19, 65)
[3] Jennifer Yick, Biswanath Mukherjee, Dipak Ghosal (2009) Wireless sensor
network survey * Department of Computer Science, University of
California, Davis, CA95616, United State (pp 2,3,5)
[4] P. Vijay Kumar and Siddarth T.S, Asst. Prof. (Sr.G) ECE DEPARTMENT,
SRM UNIVERSITY, Chennai, India, (2008) A PROTOTYPE PARKING
SYSTEM USING WIRELESS SENSOR NETWORKSInternational Journal of
Power Control Signal and Computation (IJPCSC) Vol. 1 No. 4 ISSN :
0976-268X (pp 1-10)
[5] A Thesis by T. A. S. Achala Perera (2011) ZigBee Wireless Soil Moisture
Sensor Design for Vineyard Management System, A Thesis by T. A. S.
Achala Perera
[6] Young Hun, S., et al. Performance evaluation of wireless networked control
system using time-triggered IEEE 802.15.4. in ICCAS-SICE, 2009.
[7] Hyung Seok, K., S. Joo-Han, and L. Seok,(2007) Energy-Efficient Traffic
Scheduling in IEEE 802.15.4 for Home Automation Networks. Consumer
Electronics, IEEE Transactions on, 2007. 53(2): p. 369-374.
[8] Egan, D., April-May 2005 The emergence of ZigBee in building automation
and industrial control. Computing & Control Engineering Journal, 16(2):
p. 14-19.
[9] Garcia, R.R., 02/01/2006 Understanding the Zigbee stack.
02/01/2006(Freescale Semiconductor Inc.)
[10] Rajesh Singh, Akanksha, Shashank Mishra, Ankit Joshi / International
Journal of Engineering Research and Applications (IJERA) ISSN: 2248-
9622 www.ijera.com Vol. 2, Issue 3, May-Jun 2012, pp.133-138
WIRELESS PERSONAL AREA NETWORK NODE DESIGN AND
SIMULATON OF ALCOHOL SENSOR USING ZIGBEE TRANSCEIVER
MODULE.
[11] Singh, R.; Mishra, S. Year 2011 Temperature monitoring in wireless sensor
network using Zigbee™ transceiver module Year 2011 ICPCES – 2010
ISBN: 978-1-4244-8543-
[12] Young Wung Kim; Sang Jin Lee; Guk Hee Kim; Gi Joon Jeon; , Nov. 2009
\"Wireless electronic nose network for real-time gas monitoring system,\"
Robotic and Sensors Environments, 2009. ROSE 2009. IEEE International
Workshop on , vol., no., pp.169-172, 6-7
[13] Zhao Xiaoqiang; Zhang Zuhou; , March 2010\"Development of Remote
Waste Gas Monitor System,\" Measuring Technology and Mechatronics
Automation (ICMTMA), 2010 International Conference on, vol.1, no.,
pp.1105-1108, 13-14.
[14] Guo Xiu-cai; Zhao Jing; Zhang Xin-liang; , May 2010 .\"The Research of
Remote-Monitoring System of the Gas Based on Web,\" E-Business and EGovernment
(ICEE), 2010 International Conference on , vol., no., pp.2583-
2586, 7-9
[15] Hua Fu; Tao Wang; Cui Yang; ,2009 \"Gas monitoring system based on the
multi-sensor information fusion,\" Electronic Measurement & Instruments,
2009. ICEMI\' 09. 9th International Conference on , vol., no., pp.2-930-2-
933, 16-19 Aug. 2009.
[16] CC2500 data sheet Single Chip Low Cost Low Power RF Transceiver 2008
[17] www, Wikipedia.com
[18] www. electrofriends.com
[19] www.datsheet.com
[20] Jae KyuSuhr · Ho Gi Jung · Kwang hyuk Bae Jaihie Kim (2010) “Automatic
free parking space detection by using motion stereo-based 3D
reconstruction”,: Machine Vision and Applications 21: 163–
176DOI10.1007/s00138-008-0156-9
[21] Pijush Kanti Babu,Kousik MandalJatindra Bimal Mukherjee, (2006)Coin
Operated Automatic Car Parking
| IR1 | IR2 | OPERATIONS |
| 0 | 0 | VACANT SPACE |
| 0 | 1 | 1 VACANT, 2 FULL |
| 1 | 1 | 2 VACANT1 FULL |
| 1 | 0 | ALL FULL |
