Temperature measurement

Discussion in 'The Projects Forum' started by Konstabel, Feb 17, 2008.

  1. Konstabel

    Thread Starter Active Member

    Jan 31, 2008
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    0
    I need to measure the temperature of a tub of water. What would be the best/easiest way to do this. Thermocouple or thermistor circuit? I would like to be able to dunk the sensor in the water.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If you use a LM34 or 35, you get an output that is already scaled in engineering units. What is going to be reading/displaying the temperature?
     
  3. Konstabel

    Thread Starter Active Member

    Jan 31, 2008
    52
    0
    I'll be using the A/D of an AVR and displaying the output on 7-segment displays.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The LM34 gives output in Farenheit, the LM35 in Centigrade.
    There are other options, as well:
    LM134/234/334 - adjustable current source & temp sensor
    LM135/235/335 - precision temp sensor in °K
    LM56 - dual thermostat; in case you want to have fixed triggers at certain temps.
     
  5. Carbon-based

    New Member

    Apr 28, 2008
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    0
    How would you arrange the LM35 to read a value under water?
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Dip it or wrap it in plastic would do it, you can get insulative dips pretty inexpensively at the hardware store, think rubber based coating.
     
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