Tuesday, 28 February 2012

WEEK 6


Title: Smoke Sensor / Detector(research further device)


Objective: To search the related information of the smoke sensor that will be used in this project.
Contents / Procedures: In order to understand more on the features of this sensor, the internet research has been done.


Results:
Smoke  detector is one of the common devices in a house security system.
As defined by the Wikipedia, smoke detector is a device that detects smoke, typically as an indicator of fire. Most smoke detectors work either by ionization detectors or by photoelectric detectors while others use both detection methods to increase sensitivity to smoke. Usually, in many single family detached and smaller multiple family housing, a smoke sensor is often powered only by a single disposed battery.
 Both ionization and photoelectric detectors are effective smoke sensors. Ionization detectors response more quickly to flaming fires with smaller combustion particles while photoelectric detectors respond more quickly to smoldering fires.
The smoke sensor detects smoke from a fire and sounds an alarm from the buzzer.
The smoke sensor that is under consideration to be used in this project is MQ2 Smoke Sensor. For this project, the smoke sensor will sense the smoke and buzzer will activated when there is an excessive amount of smoke.



This smoke sensor characteristics as below:
Wide detecting scope
Stable and long life
Fast response and high sensitivity
Sensing resistance: 3k ohm - 30k ohm
Suitable to detect smoke, LPG, alcohol and hydrogen
Detects combustible gases and smokes in a range of 300 - 10000ppm
The sensitivity of this sensor can be adjust using potentiometer
Conclusion: This smoke sensor is the device to detect the excessive amount of smoke. For this project, it will send the signal to the micro-controller and from the micro-controller, the signal will be send to the output device which is buzzer.

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