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Old 01-03-2010, 01:23 PM
scientistumair scientistumair is offline
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Join Date: Oct 2009
Location: ASIA
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Default interfacing pt100 to pic

I want to display and control(on/off control) temperature using pt100 as sensor and pic16f877A. I built 1mA current source using lm324 quad operational amplifier(two opam used for current source) then voltage folower then noninverting amplifier my voltage range after amplification is 2.5 to 5V.But when I give this voltage to pic16f877A to channel 0 then the voltage drop to -0.785V constant at input pin of pic16 even the resistance of pt100 and corresponding voltage changes and pic cannot control temperature(continous on signal at putput).
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