| In recent years, with the development of economy and the continuous improvement of people’s living standards, the various regions of the country have emerged a large number of high-rise buildings, at the same time, building decoration industry is rising. Modern home decoration, indoor air pollution and decorative furniture volatile organic compounds emitted (VOC) caused aroused public attention and media attention. How to control the indoor air pollution effectively has become an issue in the field of indoor air research hotspot.In this paper, a fully functional VOC gas detector, which to solve the problem of indoor air pollution, has been designed, and gas detector can detect and analysis gas of indoor in real time. Different VOC gasses can be detected, one of the specifically gasses can be measured and alarm value can be set. The detector can detect three kinds of gasses instead of a single type of gas detector today.This paper describes the design of VOC gas detector. Focuses on the composition and working principle of VOC gas detector. This design adopts the VOC semiconductor sensor and AVR microcontroller as a core component to design the VOC gas detection. This paper makes a detailed explanation of the design of the whole system in terms of hardware, MCU control circuit design, sound and light alarm circuit, keyboard interface circuits, power circuits and LCD hardware circuit and firmware programming circuit, and pointed out some of the common problems in the system design and testing process should be noted.At the end, test the performance of VOC gas detector. Through prototype testing and accuracy tests comparing the actual value and the measured value VOC gas detector that basically meet the design requirements. Verify the sensitivity and accuracy of the system. Has a compact, user-friendly, good sensitivity, high accuracy, long working time, etc., which is a more practical VOC gas detection device. |
