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pic microcontroller based temperature monitoring and control

 
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scientistumair



Joined: 17 Dec 2009
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pic microcontroller based temperature monitoring and control
PostPosted: Thu Jan 07, 2010 10:36 am     Reply with quote

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 pic16f877a controller can do this task?
I have following difficulties:
When I interface pt100 to pic then my pic doesn't read analog voltage voltage drop to constant -0.875 volts 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) ?.

Third: How to interface keypads. Should I have to interface rs485 for communication?
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Thu Jan 07, 2010 2:41 pm     Reply with quote

Quote:
my pic doesn't read analog voltage voltage drop to constant -0.875 volts
Please tell more clearly what you are trying to achieve.
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