i want literature survey of lpg gas detector

The literature related to the research topic has been reviewed for last twenty years in order to
find out work carried out by various researchers.
There are many systems for remote monitoring and control designed as commercial products or
experimental research platforms. It is noticed that most of the research carried out belongs to the
following categories
a. Internet based Monitoring using Servers, GPRS modems, etc. with different
approaches.
b. GSM-SMS protocols using GSM module individually or in combination with
Internet Technologies.
c. Monitoring using Wireless Sensor Networks.
d. Wireless Monitoring using Bluetooth, Wi-Fi, Zigbee and RF.
e. Applications have varied widely like Home Automation, Security Systems, Biomedical
applications, Agriculture, Environment, Reservoir, Bridge health
monitoring, etc.
2.1.1 Internet Based Monitoring
Internet monitoring is one of the common approaches for remote monitoring. Many researchers
have worked in field of Internet based remote monitoring.
(Saito et al., 2000) developed home gateway system for interconnecting home network
consisting of IEEE 1394 AV network and X10 power line home automation network with
Internet. This provided remote access functions from Internet for digital AV appliances like
Digital Video Camera, Digital VCR connected to IEEE 1394 network and home appliances like
TV, desk lamp, electric fan connected to X10 controller.
(Al-Ali and Al-Rousan, 2004) developed Java based home automation system via World Wide
Web. The home appliances were controlled from ports of embedded system board connected to
PC based server at home.
(Alkar and Buhur, 2005) implemented Internet based wireless flexible solution where home
appliances are connected to slave node. The slave nodes communicate with master node through
RF and master node has serial RS232 page link with PC server. The nodes are based on PIC 16F877
µc. PC server is formed of a user interface component, the database and the web server
components. An Internet page has been setup running on a Web server. The user interface and
the Internet front end are connected to a backend data base server. The control of devices is
established and their condition is monitored through the Internet.
(Al-Khateeb et al., 2009) used X10 controller interfaced through serial port to PC server for
control of devices. The Common Gateway Interface (CGI) is used to interface between the
browser and the X10 protocol via http connection. The server executes CGI programs in order to
satisfy a particular request from the browser, which expresses its request using the http.
(Peng Liu et al., 2007) developed model of web services based email extension for remote
monitoring of embedded systems which integrates web services into emails. It uses a general
purpose email messaging framework to connect devices and manipulators. This low cost model
fits for systems with low connection bandwidth, small data transportation volume and non realtime
control, e.g., monitoring of home appliances and remote meter-reading.
(Tan and Soy, 2002) developed a system for controlling home electrical appliances over the
Internet by using Bluetooth wireless technology to provide a page link from the appliance to the
Internet and Wireless Application Protocol (WAP) to provide a data page link between the Internet
and a mobile phone. However, technical details relating controller are not revealed.
(Nikolova et al., 2002) demonstrated that the control of home appliances can be extended beyond
the home network to wireless mobile networks without any modification in the network
specifications. This was accomplished by developing and implementing a HAVi (Home Audio
Video Interoperability) - WAP UI gateway that intermediates between a wired home network
and a wireless communication network using HAVi and WAP specifications, respectively. The
gateway use both pull and push technologies, improves the network integration and provides
opportunities for developing applications that combine mobile devices with home network
devices.
(Yen-Shin Lai et al., 2002) developed an Internet-based monitoring and control of fuzzy
controlled inverter for air conditioning system. The system consists of client/server,
programmable logic controller, D/A modules, inverters, induction motors and the temperature
sensing modules. The client accepts the command from the user and can also access the database
created in server, using Internet Explorer (IE) Browser. The server performs function of fuzzy
logic control, communication interface between server and PLC, and receiving command from
client. Furthermore, the server also creates a database of the sensed temperature, speed of
inverter-controlled motor drives, and reference command.
(Ximin et al., 2005) designed and implemented an Internet home automation system. The design
uses an embedded controller based on C8051F005 microcontroller which is connected to a PCbased
home Web server via RS232 serial port. The home appliances are connected to the
input/output ports and the sensors are connected to the analog/digital converter channels of the
embedded controller. The software of the system is based on the combination of Keil C, Java
Server Pages, and JavaBeans, and dynamic DNS service (DDNS) client. Password protection is
used to block the unauthorized user from accessing to the server.
(Colak Ilhami et al., 2008) developed Internet controlled Heating Ventilation Air Conditioning
(HVAC) system. The system can be controlled by three different units (web based remote
control, remote control by hand-held device and keypad control mounted on AC). The hardware
system of AC is controlled by PIC16F877 microcontroller. A DAQ board inserted into PCI bus
of web server is used to control system over web. User is able to access system parameters over
web by logging and setting parameters on forms available on main control page. User submits
forms to web server having CGI program which performs requested tasks and reports status of
system operation. The current operational parameters of the system are measured by
microcontroller and displayed on LCD. Using web camera focused on LCD, these parameters are
monitored online by client PC.
(Chen Chao et al., 2009) developed a remote wireless monitoring system for off grid Wind
turbine based on the GPRS and the Internet. The remote monitoring system is made up of three
parts: controlling terminal, central monitoring computer and communication network.
Controlling terminal consists of microcontroller ARM7 LM3S1138, data acquisition module and
GPRS communication module WAVECOM Q2406B connected to ARM7 system using serial
port. GPRS module sends parameters relating wind turbine to central monitoring computer. The
client can access central monitoring computer server through Internet and know parameters of
different wind turbines.
(Kumari and Malleswaran, 2010) developed real time based equipment condition monitoring and
controlling system using embedded web based technology which directly connects the
equipment to network as a node. The embedded system consists of ARM7 based LPC 2148 .