Now human life inside the gas has become indispensable to
people's life energy, more and more people in the use of gas at the
same time, the gas leakage accidents caused by the more and more
high frequencies, bring a lot of troubles to people's personal
safety and property security, so how to prevent gas poisoning and
explosion has become an urgent need people. Nowadays, there are many
gas alarm, and these products are mostly made of the gas leakage
of the corresponding alarm, it is family gas alarm.With the
development of society, but also in the development of gas
alarm.Microcomputer control technology, sensor has been widely
applied in industrial control, mechatronics, intelligent
instrumentation, communications, household appliances,
signi*cantly improve the technological level of equipment and
automation.
This topic design of gas alarm adopts STC89C52 MCU as thecore
components of the alarm, control of the coal gas alarm.To achieve
timing control chip, the circuit is simple, cheap, good
reliability.The gas is detected by a CO gas sensor, the resulting
concentration and concentration values are obtained by comparing
the deviation set.We get the control signal through processing the
deviation signal, to regulate the gas outlet valve, gas
concentration corresponding to eight units of A/D analog conversion
to digital quantity, and joined the keyboard input, so as to realize
the control of the household gas leak.The system's hardware circuit
design is reasonable, safe and reliable performance.
Key words:Gas alarm; MCU; sensor
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