This home smoke detector circuit warns the user against fire.
It is based on the smoke that is produced in the event of a fire and runs between the bulb and the range of light, the amount of light falling on the LDR is reduced. This type of circuit is called an optical smoke detector. Do not use it as a home smoke detector is the law for electronic projects.

This causes resistance to LDR to enlarge and voltage on the base of the transistor is pulled high the power directly to the COB (chip-on-board) has been completed. the sensitivity of the s ....etc

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1. ABSTRACT
Often we find that resedntial properties,offices,buildings etc suffer disastrous consequences due to a single short circuit or a simple fire which go undetected.To avoid such losses,one can make use of a smoke alarm which would in turn inform the concerned authority by sounding a buzzer or a sound as soon as any smoke is detected thereby avoiding danger as soon as it is detected.smoke alarm circuits today are used everywhere from resedential buildings to offices.
2. INTRODUCTION
The thermis ....etc

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I made an alarm using LDR(light dependent register). The alarm work depending on the light intensity, when light intensity will low then the alarm will rise up and when the light intensity will high then it remain off. My problem is that the buzzer is not playing continuously when the intensity is low. I need a continue beep and a reset button to reset the device and also the alarm.
Sorry, for my bad English. ....etc

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Optical Smoke Detector
Optical Smoke Detector contain a small photoelectric cell which triggers the alarm when the beam is disturbed by smoke. it shows better results in smoldering mattress.
read this material where its bravely explained, i hope its greatly usefull

http://home.howstuffworkshome-improvement/household-safety/fire/smoke1.htm
http://72.29.25.62/page.asp?ID=63
http://en.wikipediawiki/Smoke_detector

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I wish to know details of components used in vk566 smoke alarm ....etc

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smoke alcohol and lpg detection alarm seminar

This board can be used for measuring LPG leaks, which could be used in your home to identify gas leakage.This LPG Gas Sensor (MQ6) is used to detect dangerous LPG leak in your surrounding,home,car,storage tank and etc.This unit can be easily added to alarm unit to produce sound or visual indication of Gas/LPG.The sensor has excellent response time.It can used to sense iso-butane,LNG,Cigarette Smoke and propane.It can also be used for wireless gas leak detector project.

LPG Gas Sensor (MQ6) Feature ....etc

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