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pic based temperature monitoring and control

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scientistumair

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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)

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:arrow:voltage follower:arrow:noninverting amplifier:arrow:pic16f877a
I am using lm324 quad opam ic for current source and for amplifier.
Second how to generate variable pwm using ccs compiler.
 

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