Abstract
Fire accident in modern society is a disaster. We need to know the precaution against fire. Fire is relentless, and life is very fragile in the fire.
Automatic fire alarm system is a sentry who warn people the fire happened, timely alarm and output signal linkage. The design of the system mainly cover the following five aspects: sensor selection, SCM selection, interface chip selection, alarm device design,power supply design.
Automatic fire alarm system sends out a fire alarm signal to fire alarm controller through a certain way. When the fire alarm controller received alarm signal ,it will immediately send out a sound-light alarm. May realize the acousto-optics take the STC12C5410AD monolithic integrated circuit and the MQ-2 semiconductor resistance type gas sensor as the core design smog alarm apparatus to report to the police, the breakdown from the diagnosis, the density demonstrated, reports to the police limits the establishment, the time delay reports to the police and with functions and so in position machine serial port correspondence.Is one kind of structure simple, the performance stable, the easy to operate, the price inexpensive, the intellectualized smog alarm apparatus.Has certain practical value.
Keywords: Smog, alarm apparatus, STC12C5412AD,MQ-2 sensor
