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Automatic temperature control using 8085 microprocessor

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  • 1. PRESENTED BY SUBHRADEEP MITRA & DEBANJAN MUKHERJEE ROLL NO.-3513-61-0008 & 3513-61-0021 REG. NO & SESSION-063209 & 063302OF 2008-2009 UNDER THE GUIDANCE OF Mr.ARINDAM SAHA DEPT.OF COMPUTER SCIENCE SAMMILANI MAHAVIDYALAYA
  • 2. Definition of Temperature Control Temperature control is a process in which change of temperature of a space (and objects collectively there within) is measured or otherwise detected, and the passage of heat energy into or out of the space is adjusted to achieve a desired average temperature.
  • 3. Aim of the Project To control temperature To minimize manual intervention using an intelligent processor (such as 8085 microprocessor) It controls the temperature of any industrial plant.
  • 4. ATC using 8085 Microprocessor An Automatic Temperature Control Unit mainly divided into three parts- Temperature input unit Processing unit Control output unit
  • 5. Overview of ATC unit  The 8085 based trainer kit forms the basic processing unit.  The Analog-to-Digital converter unit and temperature sensor forms the temperature input unit.  The switching ON/OFF of the heater / cooler controls the heat supplied to the plant
  • 6. Basic operation of the temperature control unit  Operationally, the system requires two set points  Upper set point  Lower set point  Whenever the temperature of the plant exceeds the upper limit or recede the lower limit heater/cooler is turned-off, so that a temperature is maintained within limits.
  • 7. The main hardware consists of automatic temperature control system 1) 8085 Microprcessr unit 2) ADC interface board 3) AD 590 temperature sensor 4) Amplifier (741 op-Amp)
  • 8. The 8085 trainer kit consists of 8085 MPU IC 8KB EPROM 8KB RAM Keyboard and display controller 8279 Programmable Peripheral interface 8255(PPI) 21 key hex-keypad Six numbers of seven segment LED’s
  • 9. The ADC interface board consists of  ADC 0808, which is an 8-bit converter with eight channels of input.  Interfaced with the 8085 through 50-pin bus expansion connector.
  • 10. Basic block diagram Architecture of ATC system Sensor Amplifier Micro- processor unit ADC converter Analog Signal Amplified Analog Signal Converted Digital Signal
  • 11. Entire Circuit Diagram of control unit Heater Sensor(AD590) Differential Amplifier Using (Op-amp) ADC Converter (0808 IC) 8085 Microprocessor unit Water
  • 12. Different types of temperature sensors  Thermistor  Thermocouples  Solid state temperature sensor  I.C. Temperature sensor(LM134-3)
  • 13. Some Thermistor and its circuit diagram Rod Thermistor FIG.-Circuit diagram of Thermistor Bead Thermistor Disc Thermistor
  • 14. Thermocouples FIG.- K type Thermocouple Fig.- A Typical Thermocouple Circuit
  • 15. Solid State Temperature Sensor TEMPERATURE SENSOR Fig.-AD 590 IC Fig:-Calibration accuracy Vs. Temperature Curve of AD 590
  • 16. The sensor which We choose for this project Features of AD590 Sensitivity Better than LM135 Great calibration accuracy Fast temperature measurement FIG:-AD590
  • 17. Differential Amplifier using op-amp FIG:-Implementation of the circuit on Bread-Board FIG:-circuit diagram of Differential Amplifier
  • 18. Interfacing the 0808 with the 8085 trainer kit D7 D6 D5 D4 D3 D2 D1 D0 EOC 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 Port A Port B Port C ALE START COOLER HEATER
  • 19. ADC interfacing with the microprocessor A D C 0 8 0 8
  • 20. START CALL SUBROUTINE ADC : SET ALE (C7), SET START (C6) READ EOC (A7) IS EOC- -=0 Y N IS DATA < 19H (.5V)? , 33H(IV)? IS DATA > 98H (3V)? RESET ALE(C7) READ PORT B FOR DATA N CALL SUBROUTINE HEATER CALL SUBROUTINE COOLER Y Y FIG:-DESIGN STEPS WITH THE HELP OF FLOWCHART
  • 21. If we choose any other component other than microprocessor : Magnitude Comparator FIG:-Block diagram of IC 7485
  • 22. Application of Automatic Temperature control System In Chemical Industry
  • 23. Application of Automatic Temperature control System Nature Science
  • 24. Application of Automatic Temperature control System IN DAILY LIFE FIG:-MICRO-OVENFIG:-ROOM TEMPERATURE CONTROLLER
  • 25. Advantage of ATC system ATC system using 8085 is very simple circuit. As 8085 microprocessor Memory used as stack memory( when needed), we the programmer can store already all possible combination of data corresponding to the temperature in the memory stack. It has minimum circuitry.
  • 26. Limitation of the ATC System The system is temperature bounded. We just conceptually say that huge no. of peripheral devices must be connected through the two port, but at the time of implementation of the project we are not able to connect all possible devices with the microprocessor port. The sensibility of the system is 0.20C,so any change in temperature less than that can’t be recognized by the system.
  • 27. Future scope of the project This is a very basic automation system of temperature control. Few changes may be needed in the control circuit for controlling the system with the help of Microcontroller. It should also be able to control various temperature. If we use microcontroller rather than microprocessor the cost will be minimum. We can also use relay to control the heater and cooler subroutine automatically.
  • 28. References  Microprocessor Architecture, Programming and applications with 8085- By R.S. Gaonkar, Fifth Edition (Penram international publishing).  Microprocessor and digital systems-Douglas V.Hall, (McGraw Hill Book co.)  Introduction to microprocessor- A.P.Mathur, (Tata McGraw Hill)  MME 85S manual  IC DATA handbook  National semiconductors Datasheets
  • 29. Links • http://www.wisc-online.com/objects/ViewObject.aspx?ID=DIG3403 • http://www.scribd.com/doc/4616314/8085-Microprocessor • http://www.electronic-circuits- diagrams.com/computersimages/computersckt2.shtml • http://www.analog.com/en/AD590/productsearch.html • http://www.national.com/analog • http://www.omega.com/prodinfo/thermistor.html • http://en.wikipedia.org/wiki/Operational_amplifier_applications
  • 30. Acknowledgement We would like to acknowledge and extend our heartfelt gratitude to the following persons who have made the completion of this project possible: • Mrs.Swagata Saha Sau ,Computer Sc. Department, Sammilani Mahavidyalaya for her vital encouragement and support. • Mr. Arindam Saha, the faculty member of computer Sc dept. and also our project guide, for his immense assistance. • All faculty members and Staff. • Most especially to my family and friends
  • 31. Questions