1. Automation Of Continuous Stirred Tank
Reactor(CSTR) Using Microcontroller
Guided By:-
Mr. Pankaj Borah
Assistant Professor(Instrumentation Engineering) Submitted by:
Saikhong Basumatary(Gau – c – 10/110)
Harikanta Roy(Gau – c – 10/L -191)
Biswajit Karmakar(Gau – c – 10/L -192)
Amitesh Kumar(Gau – c – 10/L -193)

2. Content
• Introduction
• System Layout
• Components used
• Circuit Diagram
• Stirrer Control
• Heater drive using triac
• Temperature Sensor Using Thermistor
• Usbasp Programmer
• Conclusion
• Future work

3. Introduction
Temperature controllers are devices used to
accurately control process temperature without
extensive operator involvement. It is a control
system which accepts data from temperature
sensors i.e. thermistor and compares the actual
temperature to the desired set-point temperature, to
operate temperature controlling elements like heater
and stirrer.

4. System layout

5. Circuit Diagram

6. Components Used
• Microcontroller(AT mega16) - For process execution
• Thermistor NTC 103(Temperature Sensor)
• LCD display(16 X 2) – Data display
• Heater(220V) – To heat the tank
• Relay(5 Vdc)
• DC Geared motor (6v - 12 v, 100 rpm) – To run stirrer
• Triac(BT136) – To control AC voltage to heater
• Optocoupler(MOC3021) - To drive triac
• Diode (1N4007= 4nos.)
• Voltage regulator(7805 & 7812) - To provide power
• Transformer(12V,500mA) - supply to circuit

7. ATmega 16
ATMEGA16's SPECIFICATIONS : -
•FLASH -------- 16 kB
•EEPROM -------- 512 B
•SRAM -------- 1024 B
•SPEED -------- 0-16 Mhz
•VOLTS -------- 4.5 V - 5.5 V
•PINS -------- 40 (PDIP)
Here, each I/O port has 3 registers
associated with each it. These three
registers are : -
•DDRx
•PORTx
•PINx
x ----------- A, B, C, D.
•Port A – ADC input .

8. VOLTAGE REGULATOR 7805,7812
• 7805 is a voltage regulator integrated circuit. The voltage regulator IC maintains the output
voltage at a constant value. 7805 provides +5V regulated power supply. Capacitors of
suitable values can be connected at input and output pins depending upon the respective
voltage levels.
• 7812 is a voltage regulator integrated circuit. The voltage regulator IC maintains the output
voltage at a constant value. 7812 provides +12v regulated power supply. Capacitors of
suitable values can be connected at input and output pins depending upon the respective
voltage levels.

9. Relay
• A electromechanical device used to make or
break connection.
• We have used a 5 Vdc relay which can by pass
upto 240Vac.

10. DC GEARED MOTOR
• Provides high torque at low speed.
• The speed of motor is counted in terms of rotations of the
shaft per minute and is termed as RPM.

11. Stirrer Control

12. Liquid Crystal Display:
• Gets data from microcontroller.
• A 16×2 alphanumeric LCD.

13. Triac BT136

14. KMOC3021

15. Triac Driving Circuit-Controller for AC
Heater

16. Thermistor
A thermistor is a temperature-
sensing element composed of
sintered material which exhibits
a large change in resistance
proportional to a small change in
temperature.

17. Thermistor circuit

18. Usbasp Programmer
FRC

19. ATmega16 Usbasp Programmer
• We can program AVR microcontroller by using usbasp
programmer.
• We need to connect the MOSI, MISO, SCK, Reset, Vcc and
GND pin of the microcontroller to the programmer.

20. Conclusion
• CSTR is used in most of the Industries like, cement plant, food
processing industries, chemical industries, refineries etc. By
making automatic control makes the system more efficient
and reduce the manpower, hence reduce the cost of the
operation .
• Thermistor output is non – linear w.r.t. rise in temperature
but its sensitivity is high which is helpful in maintaining our
required value.

21. Future Work
• We will work on level and flow controller.
• And to make a software interface for the system for
continuous monitoring and control.

22. OUR PROJECT WORK

23. Thank you