现场总线应用...doc

西安工程大学 研究生专业课程考试答题册 得分： 阅卷人签字： 学 号： 2012315 姓 名： 何颖 考试课程： 现场总线与控制网络 考试日期： 2013.6.27 西安工程大学研究生部 摘要 ： 随着大棚技术的普及，温室大棚数量不断增多，对于蔬菜大棚来说，温湿度控制非常重要。温湿度太低，蔬菜就会被冻死或则停止生长，所以要将温湿度始终控制在适合蔬菜生长的范围内。传统的温度控制是在温室大棚内部悬挂温度计，工人依据读取的温度值来调节大棚内的温度。如果仅靠人工控制既耗人力，又容易发生差错。现在，随着农业产业规模的提高，在现代化的蔬菜大棚管理中通常有温湿度自动控制系统，以控制蔬菜大棚温度，适应生产需要。本论文主要阐述了基于AT89S52单片机的蔬菜大棚温湿度控制系统设计原理，主要电路设计及软件设计等。该系统采用AT89S52单片机作为控制器，设计了单片机最小系统模块，CAN通信接口电路、温湿度传感器电路、键盘电路和显示电路等来实现大棚温湿度的监控。 关键词：AT89S52；CAN总线；温湿度采集；显示电路 Abstract: with the popularity of greenhouse technology, greenhouses number increasing, for vegetable greenhouses, temperature and humidity control is very important. The temperature and humidity is too low, the vegetables will freeze to death or stop growing, so control the temperature and humidity is suitable for vegetable growth range. The traditional temperature control is inside the greenhouse to hang the thermometer, workers on the basis of the temperature reading to adjust the temperature in the greenhouse. If only by the artificial control consumption of manpower, which are prone to errors. Now, with the improvement of agricultural industry, in the modern vegetable greenhouses management typically keep temperature and humidity automatic control system to control the temperature of vegetable greenhouses, meet the need of production. This thesis mainly expounds the vegetable greenhouse temperature and humidity control system design based on AT89S52 single chip microcomputer principle, main circuit design and software design, etc. This system adopts AT89S52 single chip microcomputer as controller, design the single chip microcomputer minimum system module, CAN communication interface circuit, temperature and humidity sensor . Key words: AT89S52; CAN bus; Temperature and humidity acquisition; Display circuit 1.绪论 在现代化的蔬菜大棚管理中通常需要温湿度自动控制系统，以控制蔬菜大棚温度，适应生产需要。它以先进的技术和现代化设施，人为控制作物生长的环境条件，使作物生长不受自然气候的影响，做到