Remote Data Acquisition Using Wireless - Scada System

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ABSTRACT
In this paper we have developed an integrated wireless SCADA system for monitoring &
accessing the performance of remotely situated device parameter such as temperature,
pressure, humidity on real time basis. For this we have used the infrastructure of the existing
mobile network, which is based on GPRS technique Supervisory Control and Data
Acquisition (SCADA) is a field of constant development and research. This project
investigates on creating an extremely low cost device which can be adapted to many
different SCADA applications via some very basic programming, and plugging in the relevant
peripherals. Much of the price in some expensive SCADA applications is a result of using
specialized communication infrastructure. The application of infrastructure, in the proposed
scheme the cost will come down. Additionally the generic nature of the device will be
assured.
Wireless SCADA deals with the creation of an inexpensive, yet adaptable and easy to use
SCADA device and infrastructure using the mobile telephone network, in particular, the
General Packet Radio Service (GPRS). The hardware components making up the device are
relatively unsophisticated, yet the custom written software makes it re-programmable over
the air, and able to provide a given SCADA application with the ability to send and receive
control and data signals at any non predetermined time.



INTRODUCTION
Supervisory Control and Data Acquisition (SCADA) is a process control system that enables a site operator to
monitor and control processes that are distributed among various remote sites. A properly designed SCADA
system saves time and money by eliminating the need for service personnel to visit each site for inspection,
data collection/logging or make adjustments.
Supervisory Control and Data Acquisition systems are computers, controllers, instruments; actuators, networks,
and interfaces that manage the control of automated industrial processes and allow analysis of those systems
through data collection .They are used in all types of industries, from electrical distribution systems, to food
processing, to facility security alarms.[7]
Supervisory control and data acquisition is used to describe a system where both data acquisition and
supervisory control are performed. Mobile Supervisory Control and Data Acquisition (referred to as Mobile
SCADA) is the use of SCADA with the mobile phone network being used as the underlying communication
medium. GSM is a wireless communication technology; most popular today for transmitting data anywhere in
the world through SMS with the help of mobile phones.[1],[5]
General Packet Radio Service (GPRS) is chosen as the specific mobile communication protocol to use as it
provides an always on-line Inter connection without any time based charges. SMS is a globally accepted
wireless service that enables the transmission of alphanumeric messages between mobile subscribers and
external systems such as electronic mail, paging, and voice-mail systems. It is a store and forward way of
transmitting messages to and from mobiles.[16]


IMPLEMENTATION
The proposed implementation the system that solves the problem of continuous monitoring of data acquisition
system with the help of cheap wireless communication.[12],[14]
The basic components of remote monitoring system designed in this paper include sensors, Signal conditioning
device, AT90S8515 microcontroller, and mobile phone. The sensors i.e. RTD is used to measure remote area
temperature or energy meter reading. The microcontroller based data logger is fully depends on what is being
measured. The AT90S8515 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of insystem
programmable Flash memory. The microcontroller is to be programmed using C language.[11]