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pic microcontroller based temperature monitoring and control

Discussion in 'Microcontrollers, Programming and IoT' started by scientistumair, Jan 7, 2010.

  1. scientistumair

    scientistumair

    1
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    Dec 8, 2009
    I am new in microcontroller. I have task to design pic microcontroller based temperature monitoring and control using pt100 as sensor. Total 8 pt100 are to interface with pic16f877a. Set points are to be given by keypad and display should be on lcd. Control technicque should be pwm.I am using CCS compiler
    First I am controlling and display 1 temperature(i.e. using 1 pt100)
    Can single pic 16f877a can do this task?
    I have following difficulties:
    when I interface pt100 to pic then my pic doesnot read analog voltage voltage drop to constant -0.875volts at input of microcontroller. Circuit is as follows
    1ma current source-voltage follower-noninverting amplifier-pic16f877a
    I am using lm324 quad opam ic for current source and for amplifier.
    Second how to develop variable pwm in pic using pic(difference b/w set point and process variable=pwm duty cycle)
    Third how to interface keypads.Should I have to interface rs485 for communication?
     
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