Abstract: With the advances of science and technology, human society has made great progress.
In life, industrial and agricultural production, weather, environmental protection, defense,
research, aerospace and other fields, often wan to detect and control the environmental
parameters such as temperature, humidity, light intensity, gas concentration. And with the
increase of kind and range of bustible and explosive gas, the number of gas leak, fire and
explosion in the air storage warehouse increasing. Be based on security, environmental and
economic considerations, developed a practical multi-channel alarm system is necessary.
Base on this demand, this design uses a sensor to detect temperature, humidityand bustible
gas, when these parameters do not meet the pre-determined parameter values, it will
automatically alarm. Use MQ_2 gas sensor for bustible gas concentration detection, AM2301
temperature and air humidity sensor for temperature and air humidity testing, functionality and
cost-effective AVR ATmega16 microcontroller as a central processing unit, to collecting and
processing environmental parameters and alarm automatically.
The design can detectthe concentrations of a variety of bustible gas such as n-hexane, as
well as temperature and humidity, when they reaches the pre-set upper or lower limit alarm
setting values, it will send out the sound alarm signal that prompts the operator to take safety
measures or automatic control safety devices.The alarm system can accurately detect bustible
gas in real time, as well as temperature and humidity, and can reliably and correctlywork for a
long time. It has a very broad application prospects and promotion value.
Key words:flammable gas temperature and humidity single-chip microputer alarm
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