Smoke and fire alarm sensor

Discussion in 'The Projects Forum' started by RRITESH KAKKAR, Aug 19, 2013.

  1. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Hi,

    i need to make a fire and smoke detector security system...
    I have done using NTC and bimetallic strip in school days now i want to make it more sensitive so, please tell is there any chance to make it homemade??


    Thanks
     
  2. WBahn

    Moderator

    Mar 31, 2012
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    For YOU to make it homemade? Pretty much... no.
     
  3. WBahn

    Moderator

    Mar 31, 2012
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    But, I'd love to hear how you used an NTC resistor and/or a bimetallic strip to detect smoke.
     
  4. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    heat detection near it...any suggestion for making or buying...
     
  5. WBahn

    Moderator

    Mar 31, 2012
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    Gee, I didn't realize that smoke was all that hot.

    My suggestion is that you buy. In fact, you should buy a complete system according to the recommendations of a professional and have them install it.
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    I built smoke- fire detector [ 1972 ] using a Figaro T. G. S. # 109, gas detector. In side by side comparison it beat out a comercial smoke detector by several minutes but it required more operating power. It would trip on 250 ppm of propane. At one time R.S. carried the sensor.
     
  7. ScottWang

    Moderator

    Aug 23, 2012
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    Using a LDR(CDS) can be a smoke detector, when the smoke didn't caused by the gas.

    Using NTC resistor to detect when the heat reach to some setup level.

    Using the gas detector to detect when the gas have any leakage.
     
  8. strantor

    AAC Fanatic!

    Oct 3, 2010
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    I ran across these turbidity sensors for washing machines a while back while looking for optical sensors. Maybe if they can detect turbid water, they can detect turbid air?
     
  9. ScottWang

    Moderator

    Aug 23, 2012
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    I think the turbid air can be detected by the turbidity sensors.

    Detecting the turbid air as smoke, turbid water, whatever you are using LDR(CDS) or IR or photo transistor, the theories are the same.
     
  10. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Bernard likes this.
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