席博雄毕业论文最终稿

Abstract

With the development of science and technology, especially digital

technology and the development of information technology, making the development of humidity sensors is more and more attention. With China's scientific and technological, economic and social sustainable development, makes the industrial process control, facilities, agriculture, bio-medical, environmental control as well as aerospace, defense engineering and other fields have become increasingly demanding of high humidity, there is an urgent need for various types of humidity measurement system, in order to achieve a more sensitive and more accurate, faster and more reliable real-time detection.

The graduation project is the main indoor humidity measurement system. Humidity sensors used mainly for industrial field, indoor, plant, such as the measurement of humidity. Previous analog hygrometer do not want to because of the accuracy, combined with numerical trouble to read and there is a big error, and digital hygrometer readings to facilitate intuitive and accurate. Thus, regardless of the number of humidity measurement system for industrial production, or on people's living environment has very important significance[12].

For this reason, this design uses a single-chip graduation AT89C52, HD7279, ADC 0809, zoom through the LM324 by AT89C52 to deal with LED display.

This paper analyzes the structure and function of the humidity sensor linear relationship, combined with design issues, given the detailed design of the system hardware and software, the process by the main program, data collection procedures, procedures for processing and display keys alarm procedures.

Keywords: Humidity sensor; single-chip microcomputer; A / D converter;

LM324 amplifier