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Design and implementation of embedded temperature and humidity acquisition system based on AVR

2012-12-26
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　　This article mainly talks about the design and implementation of an embedded temperature and humidity acquisition system based on AVR. Temperature is a physical quantity that indicates the degree of hotness or coldness of an object. Microscopically speaking, it is the intensity of the thermal motion of the object\'s molecules. Temperature exists everywhere in the entire universe. Whether on the earth or on the moon, whether on the scorching sun or on the cold Pluto, all of these have temperature differences due to different spatial positions. Humidity is a physical quantity that indicates the dryness of the atmosphere. The less water vapor contained in a certain volume of air at a certain temperature, the drier the air; the more water vapor, the more humid the air. The dryness and wetness of the air is called \"humidity\". In this sense, physical quantities such as absolute humidity, relative humidity, comparative humidity, mixing ratio, saturation difference and dew point are often used to express it. Humidity indicates the water vapor content in the gas, and there are two ways to express it: absolute humidity and relative humidity. Absolute humidity is the mass of water vapor contained in a certain volume of air. Generally, its unit is grams per cubic meter. The maximum limit of absolute humidity is the highest humidity under saturation; relative humidity is the ratio between absolute humidity and highest humidity, and its value shows how high the saturation of water vapor is.

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