Sunday, January 23, 2011

Smoke alarm project using 555 timer IC

-Pradeep G
This project uses a 555 timer IC with an optical sensor to create a smoke detection alarm system. The optical sensor consists of an IR diode and a photodiode with a small gap in between. During normal condition the photodiode is receiving the IR signal from the IR diode. The presence of smoke interrupts the signal to the photodiode which in turn activates the 555 timer IC to generate alarm. The timer IC is configured as an astable multivibrator with a frequency in the audible range.


 


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16 comments:

  1. UnknownSeptember 13, 2011 at 5:45 AM

    Is it working???

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  2. Ultimate AppliancesSeptember 28, 2011 at 2:42 AM

    Interesting and important information. It is really beneficial for us. Thanks

    Undercounter freezers

    ReplyDelete
  3. B.Karthik PatnaikNovember 21, 2011 at 11:01 PM

    thanx dude its working nice circuit

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  4. AnonymousJune 22, 2012 at 5:47 AM

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  5. piyushSeptember 6, 2012 at 11:39 AM

    what is the price of the photo interrupter module ???

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  6. TittuNovember 22, 2012 at 3:20 AM

    Very Nice Circuit.......

    Electronics Circuits

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  7. Div ShahNovember 22, 2012 at 8:47 AM

    what would be approx. cost of making this project ?

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  8. schotMarch 14, 2013 at 3:11 AM

    IT WORKS!!!
    IT COSTED ME AROUND 50-60rs

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  9. nehaApril 12, 2013 at 9:51 AM

    could you plz tell me how to collect information to write a project report on this topic,i am a 2nd yr student nd ve to submit a project report on it?

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  10. UnknownJuly 18, 2013 at 12:15 AM

    You will sleep worry-free protected by smoke detectors and fire extinguishers. Fire safety is very important to all households and businesses.

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  11. UnknownJuly 20, 2013 at 1:35 PM

    This comment has been removed by the author.

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  12. UnknownAugust 2, 2013 at 4:14 AM

    if we replace the photo interrupter module by a photo transistor and an infrared led,will this circuit work as a burglar alarm?

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  13. AnonymousNovember 4, 2014 at 1:53 AM

    Takk for god informasjon, innholdet er stille interessant. Jeg vil vente på ditt neste innlegg.
    Liten røykvarlser

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  14. UnknownJanuary 29, 2016 at 4:15 PM

    It work its cost around 60 to 70

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  15. UnknownJanuary 29, 2016 at 4:16 PM

    It work its cost around 60 to 70

    ReplyDelete
  16. UnknownJune 25, 2017 at 8:39 AM

    E isso ai meu amigo.muito bom

    ReplyDelete