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Thermometer Circuit

Discussion in 'General Electronics Discussion' started by alexlongaretti, Sep 17, 2017.

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  1. alexlongaretti

    alexlongaretti

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    Sep 17, 2017
    Hello Guys,

    I found this circuit. It should tell the user if the water is too cold, to hot or the correct temperature to bath a baby.
    At the moment, this circuit only tells the user is the water temperature is too hot, or below the chosen temperature. So at the moment, this circuit only has 2 outputs.

    Is there any way of adding another output to the circuit, so that it can also warn the user if the water temperature is too cold?

    Thanks in advance.
     

    Attached Files:

  2. kellys_eye

    kellys_eye

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    Jun 25, 2010
    You want a window comparator circuit to do that.
     
    Arouse1973 likes this.
  3. alexlongaretti

    alexlongaretti

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    Sep 17, 2017
    Can you please explain me what that is?
    Thanks
     
  4. alexlongaretti

    alexlongaretti

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    Sep 17, 2017
    Sorry, but I'm not an expert in this sector.

    Is this a complete circuit by itself, or should I integrate it in my previous circuit?

    Thanks
     
  5. Bluejets

    Bluejets

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    Oct 5, 2014
    When my kids were babies, we used our elbow. No batteries, failsafe and accurate.
     
  6. alexlongaretti

    alexlongaretti

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    Sep 17, 2017
    But this is a school project.
    That's why I'm asking
     
  7. kellys_eye

    kellys_eye

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    Jun 25, 2010
    It would be easier to make one from scratch than to modify the circuit you have.
     
  8. alexlongaretti

    alexlongaretti

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    Sep 17, 2017
    And do I have to make a window comparator circuit in order do do that?
     
  9. kellys_eye

    kellys_eye

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    Jun 25, 2010
    Yes.
     
  10. BobK

    BobK

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    1,688
    Jan 5, 2010
    There is nothing mysterious about a window comparator. It is just one comparator for the high end and one for the low end.

    Using a standard comparator IC with open collector outputs, the two outputs can be wired together to a single pullup resustor to give a low signal when out of range and a high signal when in range.

    Bob
     
  11. alexlongaretti

    alexlongaretti

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    Sep 17, 2017
    Hello guys,
    Do you think the attaches circuit suits well for what I need?

    Thanks in advance
     

    Attached Files:

  12. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    If this is a school project, aren't you supposed to do the work, or at least understand the circuit that you "borrow?"

    Bob
     
  13. alexlongaretti

    alexlongaretti

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    Sep 17, 2017
    I AM understanding it.

    I just wanted someone else's opinion.
    Thanks
     
    Last edited: Sep 19, 2017
  14. duke37

    duke37

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    772
    Jan 9, 2011
    What is the IC? Does it have a ground connection?
     
  15. alexlongaretti

    alexlongaretti

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    Sep 17, 2017
    The IC is the following: TCA965

    Yes, it should have a ground connection, as you can see here.

    For more info you can Google this: TCA965 Datasheet
     
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