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Abstract

Charged with measuring the temperature as a feedback control system, in the chemical, petroleum, metallurgical production process of physical and chemical reactions, temperature is often a very important quantity, require accurate control. In addition to these departments, the temperature control system is also widely used in other areas, is very versatile and a class of industrial control systems. Temperature control system used to keep the temperature constant or to temperature changes in accordance with a prescribed procedure.

In this paper, the design of air conditioning for example, introduced to AT89S51 microcontroller core temperature controller to control the design process, the temperature setting range is -10 ~ 45 ¡æ, the minimum temperature distinction between 1 ¡æ., Standard temperature ¨Q 1 ¡æ. With the LCD display shows the current temperature. The temperature can be set automatically according to heating or cooling treatment. Design a control system circuit unit. Used in the design of high-precision temperature sensor

AD590 on the indoor temperature in real-time accurate measurement of ultra-low temperature drift, high-precision operational amplifier OP07 level the temperature - voltage signal amplification, and then carried into the ADC0809 A / D conversion, the temperature will be collected signal transmission to the microcontroller, controlled by the MCU monitor and compare the acquisition is consistent with temperature and set temperature, and then drive air conditioning heating or cooling cycle to process the air to simulate the temperature control unit for air conditioning work.

The overall program design were the design, hardware design, software design, and several other parts of the design process fluid, involving the circuit is more reasonable. The design of the hardware design, unit circuit design, component selection such as more unique.

Key words: air-conditioning, temperature, AD590, ADC0809, LCD1602

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