Digital temperature controller

Discussion in 'The Projects Forum' started by rasheed_it, Feb 17, 2012.

  1. rasheed_it

    Thread Starter New Member

    Mar 26, 2011
    12
    0
    I am currently working on the circuit attached. However I need to use 3- wire pt-100 as the temperature sensor instead of ds1620.... Please help.
     
  2. Felo

    Member

    Feb 20, 2012
    91
    13
    Hi,

    To build such a controller around a pt-100 you have to re-think everything starting with:

    -Pt's require a stable constant current source for them to work propperly
    -Feed the output to a good low tolerance resistor to turn the current into a measurable voltage
    -Feed this voltage to an ADC converting IC or MCU pin. (if ADC is supported)

    As it is, I would reccomend you to stick with the DS sensor.

    Good Luck.
     
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