1. SCADA BASED TEMPERATURE
MONITORING SYSTEM
Submitted by:
Vipul Mehta 06111503009
Manav Mittal 07211503009
Shaily Pal 07611503009
Sajal Jain 08911503009

2. 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.

3. PROPOSED MODEL

4. BLOCK DIAGRAM

5. 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

6. POWER SUPPLY
230 V AC
50 Hz
5V
DC
12V step down
transformer
Filter(470µf)
5v RegulatorBridge rectifier

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

8. Pin Description

9. 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

10. 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.

11. 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).

12. 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.

13. 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.

14. 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

15. SCHEMATIC DIAGRAM

16. • 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

17. OPERATIONAL LAYOUT

18. 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).

20. 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.

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

22. FUTURE SCOPE
Food Monitoring Industry
Temperature Control in a Multi-level Building
Temperature Monitoring in a Mall

23. THANK YOU