摘要：虽然我国经济实力在不断的增强，但与之而来的环境污染问题也越来越严重，尤其是空气质量问题，在越来越多的人开始关注空气质量时，本设计就显得很有实用性和现实意义。本设计以单片机STC89C52为控制核心，采取软件仿真与实物设计相结合的研究方法。本设计采用模块化的设计思想，主要包括：有害气体浓度采集、温湿度数据采集、核心控制系统、显示和报警等几大模块。通过传感器MQ135和DHT11分别对室内有害气体和温湿度进行检测，并将测量结果送给单片机STC89C52处理，然后再将数据送至显示器LCD1602显示。当有害气体浓度超标或温湿度测量值超出设定范围时，单片机控制报警装置报警。调试结果表明，本设计运行良好且稳定，测量精度较高，操作简单，实时性强，成本低。综合评价此结构设计简单实用，符合当今智能化需求，将在智能家居方面有很大市场空间。42114

毕业论文关键词：传感器；单片机；空气质量；检测处理

Design of Air Quality Detection System Based on Single Chip Microcomputer

Abstract: Although China's economic strength is constantly enhanced, but with it comes the problem of environmental pollution has become increasingly serious, especially air quality problems, when more and more people are concerned about air quality, the design becomes very practical and practical significance. The design of microcontroller family STC89C52 as the control, to take research methods of physical design and simulation software combination. The design uses a modular design include: concentration of harmful gases collected, temperature and humidity data acquisition, the core control system, several modules display and alarm. Indoor harmful gases and temperature and humidity are monitored by the sensor MQ135 and DHT11, and the measurement results to the microcontroller STC89C52 processing, then data to monitor LCD1602 display. If the concentration of harmful gases or excessive temperature and humidity measurement value is not within the set range by SCM alarm. Debugging results show that the design and operation of good and stable, high accuracy, simple operation, real-time performance and low cost. This comprehensive evaluation of the structural design is simple and practical, in line with the needs of today's intelligent, it will have a huge market space in terms of smart home.

KeyWords: The sensor; Single chip microcomputer; Air quality; Detection processing

目  录

摘要 1

引言 2

1.系统方案的总体设计 2

1.1 有害气体浓度和温湿度采集模块的选择 3

1.2 系统控制模块的选择 4

1.3 显示模块的选择 4

2.系统的硬件电路设计 5

2.1 主控电路设计 5

2.2 温湿度采集电路设计 6

2.3 有害气体浓度采集电路设计 8

2.4 显示电路设计 9

2.5 报警电路设计 11

3.软件设计 11

3.1 主程序设计 11

3.2 有害气体检测和温湿度采集程序设计 13

4.仿真调试与分析 13

5.总结 16

参考文献 16

附录 17