interfacing pt100 to pic

Discussion in 'Embedded Systems and Microcontrollers' started by scientistumair, Jan 3, 2010.

  1. scientistumair

    scientistumair Thread Starter New Member

    Joined:
    Oct 23, 2009
    Messages:
    2
    Location:
    ASIA
    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).
     
Loading...

Related Site Pages

Share This Page