马铃薯分级机电控制系统的设计.doc

马铃薯分级机电控制系统设计 陈文杰 PAGE PAGE 39 本科毕业论文 题 目 马铃薯分级机电控制系统设计 学 院 工 学 院 专 业 农业电气化及自动化 毕业届别 二 〇 一 一届 姓 名 陈 文 杰 指导老师 高 晓 阳 职 称 教 授 甘肃农业大学教务处制 二 O 一 一 年 五 月 马铃薯分级单片机控制系统设计 摘要：甘肃地处西北内陆，气候干旱少雨，农业生产受气候环境因素的影响较大，制约着农业生产的持续稳定发展和农民收入的快速增加。但是，甘肃干旱半干旱农业区的马铃薯生产条件相对较好，是我国马铃薯的优良生产基地，尤其是马铃薯品质和加工产量在全国已有相当的知名度。依据国家马铃薯分级标准，本设计以AT89C51单片机为核心，设计了信号调理电路、A/D转换电路、信号输出电路和键盘/显示单元等单片机分级控制系统。工作时，系统通过选择FJ21型压敏式压力传感器采集马铃薯种薯重量产生的电压信号，将该模拟信号经型号为LM324的放大器放大、一阶低通滤波电路滤波后，送入AD1674作为A/D转换单元的A/D转换器，转换后的数字信号进入AT89C51单片机；设计了分级系统的运算处理软件，分选得出马铃薯种薯等级，向分选开关发出控制信号，实现了对马铃薯的动态称重和实时分选控制。 关键字：马铃薯分级，单片机 ，电子称重 Abstract:：Little rain designing that Gansu Province keeping a foothold is located in northwest inland , the climate is arid originally, that the agriculture produces the effect accepting the climate environmental factor is more speedy than big , being restricting continuing for that the agriculture produces to stabilize development and the peasants income increase by. Arid partly arid Gansu Be the monolithic machine systems turn to take AT89C51 monolithic machine as core , match it with signal several parts such as output circuit and keyboard/ display element nursing circuit , A/D change-over circuit , signal health. And voltage analog signal that system produces by the fact that pressure-sensitive dyadic pressure sensor collects fruit weight when working,the digital signal changing the queen enters the AT89C51 monolithic machine , handle the queen by that system software carries out an arithmetic , reach the subordinate fruit size classification grade with owing signal amplification , the wave filtering queen , sending in the A/D converter, development weighing and real time size classification sending out amounts switch signals , coming true to fruit to size classification switch control. Keyword: