| dc.description.abstract | Security is a prime concern in our day-today life. Everyone wants to be as much secure as
possible. A smoke detector is a device that detects smoke. typically as an indicator of fire.
Commercial, industrial, and mass residential devices issue a signal to a fire alarm system.
while household detectors, known as smoke alarms, generally issue a local audible and/or
visual alarm from the detector itself. Smoke detectors save thousands of lives each year.
In fact, it is recommended that every home have one smoke detector per floor. Our
smoke detectors consist of two basic parts: a sensor to sense the smoke and a very loud
electronic hom to wake people up & water flow automatically to reduce fire.To design &
construct a fire alarm system,, first information has been collected from books. Electronic
circuit of this digital lock has been designed using Op amp & flip flop. Some electronic
components shops have been visited and the required components have been purchased
from Patuatuli market, Dhaka. According to the design all those electronic components
have been populated in printed circuit board by soldering iron.
The primary objective of this project is to indicate the fire which is control by flip-flop ic
When smoke pass between light source and ldr it will indicate gradually through led.
When smoke is low then ledl will be on. As the smoke is high then led 2,3, 4 will be on
and when led 4 will be on then buzzer will be also on & water flow automatically.Here
we can use two separate switch to control alarm & water flow.
After construction this digital lock it has been found to be very accurate and effective
requiring only Tk 5,000 to purchased it. So this project can be a very economical and
effective | en_US |
