SCADA BASED TEMPERATURE MONITORING SYSTEM

Submitted by:Vipul Mehta 06111503009

Manav Mittal 07211503009 Shaily Pal 07611503009 Sajal Jain 08911503009

INTRODUCTION

• Temperature logging System with 8 temperature sensors in multiplexed

mode fed to the MC through ADC 0808.

• Values of the sensors sent serially by MC through Max 32 IC to the

Computer.

• Software “DAQ System” on the Computer takes these values, shows them

on its front panel, logs them to the data base "daq.mdb".

• Parameters like set point, low limit, and high limit on the computer screen

can be set.

• Increase in temperature beyond set point enables MC to control relay

driver IC ULN2003.

• The heaters are turned ON or OFF with the activation of alarm on

temperature reaching above high limit or below low limit.

PROPOSED MODEL

BLOCK DIAGRAM

HARDWARE REQUIREMENTS

Components Type

Power Supply 5V DC

Microcontroller AT89S52/AT89C51

ADC 0808

Serial Communication MAX232

Relays

Connector DB9

Temperature Sensor LM35

ULN 2003

LED

Resistor & Capacitor

POWER SUPPLY230 V AC 50 Hz

5V DC

12V step down transformer

Filter(470µf)

5v RegulatorBridge rectifier

MICROCONTROLLER 8051Has on-chip RAM, ROM, I/O ports.A smaller computer

Pin Description

ADC 0808

• Data acquisition component,monolithic CMOS

device.

• 8-bit analog-to-digital converter, 8-channel

multiplexer.

• Uses successive approximation as the conversion

technique.

• Resolution 8 Bits

• Total Unadjusted Error ±1⁄2 LSB and ±1 LSB

• Single Supply 5 VDC

MAX 232

• Converts signals from an

RS-232serial port to signals

compatible in TTL digital logic circuit.

• Dual driver/receiver.

• Changes a TTL Logic 0 to between

+3 and +15V, and TTL Logic 1 to

between -3 to -15V, and vice versa for

converting from RS232 to TTL.

DB9 CONNECTOR

The DB9 (originally DE-9) connector is an analog 9-pin plug of the D-Sub miniature connector family (D-Sub or Sub-D).

TEMPERATURE SENSOR(LM35)

• Precision integrated-circuit temperature sensors.

• Output voltage is linearly proportional to the Celsius

temperature.

• No requirement of any external calibration or

trimming to provide typical accuracies of ±1⁄4˚C   at

room temperature and ±3⁄4˚C over a full −55 to

+150˚C temperature range.

RELAY DRIVER (ULN 2003)

• A high voltage and high current Darlington transistor array.

•Includes seven NPN Darlington pairs amalgamating high-voltage outputs with common-cathode Clamp diode for switching inductive loads.

•Has 2.7kW series base resistor for each Darlington pair for operation directly with TTL or 5V CMOS devices.

RELAY

•Electro magnetic switch

•Used to control the electrical devices

•Operation by copper core magnetic flux.

•COM = Common, always connect to this; it

is the moving part of the itch.

•NC = Normally Closed, COM is connected

to this when the relay coil is off.

•NO = Normally Open, COM is connected to

this when the relay coil is on

SCHEMATIC DIAGRAM

• Retrieves real time data from the high temperature furnaces on computer

using LM35 sensors.

• Data converted to digital through ADC0808.

• As LM35 is heated the voltage at output pin increases, it is connected to the

analog to digital convertor IC (ADC).

• Now MC process this data and communicates with computer via RS232

communication and simultaneously switches ON & OFF the relays.

• Max232 IC is used for RS232 communication and ULN2003 IC is used for

relay control.

• Software is used for keeping the real time records of heat sensors in computer.

This software has a provision for eight sensors but only four have been used

here.

FUNCTION

OPERATIONAL LAYOUT

SOFTWARE REQUIREMENTS

Keil an ARM Company makes C compilers for

ARM7/ARM9/Cortex-M3, XC16x/C16x/ST10, 251, and 8051

MCU families.

Compilers are programs used to convert a High Level

Language(source code) to object code.

The programs written in one of the HLL like ‘C’ will compile

the code to run on the system for a particular processor like

x86 (underlying microprocessor in the computer).

APPLICATIONS

Small ruggedized computer provides intelligence in the field and allows the central master to communicate with the field instruments.

Used in process industries where there is a need for simultaneous and fast acquiring of data and control.

ADVANTAGES

Allows us to view all the parameter readings simultaneously on the PC screen.

FUTURE SCOPE

Food Monitoring IndustryTemperature Control in a Multi-level BuildingTemperature Monitoring in a Mall

THANK YOU