Temperature Sensor

Discussion in 'General Electronics Chat' started by AMIT_GOHEL, Sep 24, 2010.

  1. AMIT_GOHEL

    Thread Starter Member

    Jul 13, 2010
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    7
    I'm developing a project of fire alarm.
    according to your view which temperature detecter can be used.
    Actuly i'm connecting temp senser to microcontroller.

    Can anyone sugges me any IC/CKT which just sence the temperature variation (i don't need to measure it)?

    Thank you .Friends...
     
    RRITESH KAKKAR likes this.
  2. BillB3857

    Senior Member

    Feb 28, 2009
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  3. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Fire alarms generally use smoke detectors, not temperature sensors.
    The selection of temp sensor depends on what temperature will be considered a fire. For example some sensors with digital outputs are available up to 150°C, while linear sensors could go up to 250°C, and thermocouples maybe even up to 1000°C.
     
    RRITESH KAKKAR likes this.
  4. arachne007

    New Member

    Sep 23, 2010
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    3
    Hi,
    Maybe you can use Dallas DS1820. It has upper and lower trigger points stored in NVRAM. Only eat 1 data pin of micro (bidirectional). Temp range: -55 to +125C
     
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  5. AMIT_GOHEL

    Thread Starter Member

    Jul 13, 2010
    67
    7
    How can i forget Thermistor , even i've written a one page short note on exam..
    however somthing learn positive today..
    Thanks BillB3857.
     
    RRITESH KAKKAR likes this.
  6. BillB3857

    Senior Member

    Feb 28, 2009
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    Hope it was a help. Are you going to be looking at rate of change to determine a problem?
     
  7. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
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    I have also make few fire alarm project using metallic strip temp. depended, in school time and now few month's back by using IC 741 with NTC thermistor and ldr.
     
  8. AMIT_GOHEL

    Thread Starter Member

    Jul 13, 2010
    67
    7
    Actuly it's my final semester project, so can not put smoke senser cause i've to make out as compect as possible.

    My actual idea was to fire a match and take it near senser, and led/alarm starts.
    I'm Also suppose to use a skimmit trigger for compassion with actual temp.
     
  9. AMIT_GOHEL

    Thread Starter Member

    Jul 13, 2010
    67
    7
    I will place a schmitt trigger to compare with actual temp..

    And yes you have helped a lot..
     
  10. AMIT_GOHEL

    Thread Starter Member

    Jul 13, 2010
    67
    7
    Does DS1820 is widely used temp senser/detecter ?
    AS i guess DS1820 may not be available in my city.
    Otherwise I can use thermister,but it's unreliable ...

    Any alternative ??
     
  11. BillB3857

    Senior Member

    Feb 28, 2009
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  12. marshallf3

    Well-Known Member

    Jul 26, 2010
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    There are various mechanical temperature sensors that could be used. As to an IC I'm quite fond of the LM335 but you've got to learn how to work with the chip and will have to build the interface circuitry.
     
    RRITESH KAKKAR likes this.
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