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Temperature controller using 8085

  • Temperature measurement is used in variety of applications like furnace, water bath, oven, etc. with the help of transducers like thermocouple.

  • The output of thermocouple is proportional to temperature which is in milliVolts. Therefore to drive further stages of system, this signal is amplified using instrumentation amplifier.

  • The amplified output is fed to channel 3 of ADC and 8085 provides High to Low SOC and ALE signal.

  • When ADC completes the conversion, 8085 reads the equivalent digital data from Port A which is the current value of temperature of object.

  • This value of measured temperature is then sent to display system.

  • For measuring temperature of furnace, water bath, etc. 8085 1st measures current temperature (t1) and compares with the reference temperature (T1) at which the temperature is to be kept constant.

  • If the measure temperature (t1) is greater than reference temperature (T1) then 8085 sends control signal to the transistorized relay circuit through Port B and turns OFF the heating process to maintain temperature at desired level.

  • If the measure temperature (t1) is less than reference temperature (T1) then 8085 sends control signal to the transistorized relay circuit through Port B and turns ON the heating process to maintain temperature at desired level, thus maintaining the temperature of furnace, bath tub, etc.


  • Chips select Logic:
    Temperature controller using 8085

    Control word Format: Temperature controller using 8085 =98H


    Data for channel selection:
    Temperature controller using 8085 =0BH (SOC= HIGH)

    Temperature controller using 8085 =03H (SOC= LOW)


    Data for turning Heater ON/OFF:
    Temperature controller using 8085 =00H (Heater OFF)

    Temperature controller using 8085 =01H (Heater ON)


    Program:
    Temperature controller using 8085

    Interfacing Diagram

    8155 Interfacing






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