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.




15 comments:

Gandhi Parth said...

Is it working???

Ultimate Appliances said...

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

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B.Karthik Patnaik said...

thanx dude its working nice circuit

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piyush said...

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

Tittu Thomas said...

Very Nice Circuit.......

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Div Shah said...

what would be approx. cost of making this project ?

schot said...

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

LedTvRepair said...

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Very Nice Post.
Good information nowadays.
Thanks for sharing with us.

pammi said...

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?

Firepro Nevada said...

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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Noha Wahdan said...
This comment has been removed by the author.
jahh gel said...

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

Mariya Disuja said...

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