Abstract
The air purifier is a branch of air conditioning that has been used to maintain a comfortable environmental quality in domestic circumstances. A tin oxide gas sensor is used to detect air tained by smoke and polluted air. The sensor also has sensitivities to various gases, for example, the gases given off from human bodies. Temperature, humidity and air-flow sensors are also used, and the indoor environmental quality (IEQ) is controlled simulatively by suing a pulse motor fan. The speed of the fan is controlled by fuzzy reasoning and the degree of comfort is indicated as a grade using membership functions for the sensors.
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