文档介绍：摘要
我国粮食消费需求将呈刚性增长,而耕地减少、水资源短缺、气候变化等对粮食生产的约束日益突出。中国是粮食生产与消费的大国,如何能更有效的存储粮食,控制温度是问题的关键,烘干塔的烘干过程是粮食生产中的关键环节。本系统通过传感器对温度进行检测,通过信号调理送入单片机,单片机通过算法对信息进行运算处理,送出显示。本系统测温灵敏,反应迅速,系统稳定性高。通过键盘扩展可以选通四点检测当中的任意一点送入显示,方便准确。在系统设计时,要求单片机上电能可靠复位,防止程序跑飞导致系统死机。另外增加看门狗系统,使单片机正常工作。
关键词粮食烘干过程控制温度传感器
Abstract
Commissary consumer demand rises quickly..However, irrational development of the land, arable land is decreasing and water resources short seriously and climate changing which is controlled outstanding day by day. China is a major grain producer as well as a major grain to store grain effectively and control temperature is the key .The way to solve the problem is the process of driers .The system measures temperature with signal adjust for sending to single-chip puter which deal with arithmetic to display by a system uses assembler language to approach reaction of hardware is more stable for system4 .Each of 4points examines sends to display through key expander for accuracy and designing this system, Electric energy is requested for ability to reset through puter. Prevent program fleet in case puter crashed. In addition,Raise a watchdog to make puter work normally.
Keywords grain dry;course control ;temperature sensor
目录
第一章绪论 1
1
粮食的损失原因...........................................2
粮食烘干塔...............................................2
.................................... 3
4
第二章方案论证 6
........................................7
..............................................7
......................................8
第三章单片机测温与控制电路设计 9
9
13
14
15
A/D转换电路........................................... 16
.................................................. 17
AT89C51的结构.......................................... 17
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