Fire Monitor
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13-12-2009, 05:32 PM

Fire Monitor
This project and implimentation Fire Monitor is used to monitor the Temperature of two Rooms and if the sensor found any fire in the Room then the alarm will be switched ON until the Fire is put off else the Reset button is pressed. The Fire was sensed by using the Thermistor. The Thermistor is a passive device which has a Negative Temperature Co-efficient (NTC), i.e when the temperature increases then the resistance of the Thermistor will decrease. A analog comparator is used for the fire sensor circuit , at normal temperature the output of the comparator is low, and if there is any fire hazard, then the temperature increases and therefore the resistance of the Thermistor decreases and the output of the comparator goes High which Trigger the Microprocessor though the PPI 8255. Then the Microprocessor will switch ON the Alarm for fire. The above system is monitored and controlled by the 8 bit Microprocessor. The Microprocessor continuously monitors the two sensors and if any one of the sensor sense Fire then it latches the sensor and the microprocessor switch on the Alarm according to the software stored on the RAM
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