毕业设计论文(dsp的粮食水分测试仪设计).doc

2009届毕业生 毕业论文 题 目: 基于DSP的粮食水分测定仪设计 院系名称： 专业班级： 学生姓名： 学 号： 指导教师： 教师职称： 讲 师 2010 年 05 月 10 日 摘 要 本文的设计是基于DSP的粮食水分检测仪的设计，采用了干燥减量法。干燥减量法是经典的水分测量方法，它通过测量样品在干燥前和干燥后的质量变化来计算样品的水分含量。 本文通过采用微波和红外同时加热的方法,两种加热方式相互弥补，大大缩短了样品干燥的时间。本设计不仅可以用来测量粮食水分含量，也可以用以完成一些简单的称重操作。 该水分测试仪控制采用DSPTMS320LF2407，压力传感器在测得加热前后样品质量的变化后，经过放大电路放大后，送入A/D转换芯片中转换，单片机得到新后经过计算将结果显示在LCD显示屏上。A/D芯片采用24位A/D转化芯片AD7711,能实现24位无丢失码操作，具有抗干扰能力强、受噪声环境影响小的优点。本设计包含四按键键盘，按键电路配置灵活，软件结构简单，非常方便使用。此外，为了更好的对测量数据进行处理和保存测量结果，在测定仪上设计了串行通信接口，以便对测量数据作进一步后续处理。 关键词  Title Dsp-based design of grain moisture meter Abstract This design is based on grain moisture tester DSP design, using a drying loss method. Loss on drying moisture measurement method is the classic method, which by measuring the sample in dry mass before and after drying to calculate the change in sample moisture content. In this paper, while using microwave and infrared heating method, the two heating methods complement each other, greatly reducing the sample drying time. This design not only can be used to measure moisture content of grain can also be used to complete some simple weighing operation. Control the use of DSPTMS320LF2407, pressure sensor measured changes in quality of the sample before and after heating, the amplified through amplifier, into the A / D conversion chip to convert, get new microcontroller has been calculated after the results displayed in the LCD display. A / D chip 24-bit A / D conversion chip AD7711, can achieve 24-bit no missing code operation, with strong anti-interference by noise, the advantages of low environmental impact. The design consists of four key keyboard, keypad circuit configuration flexibility, the software structure is simple and very easy to use. In addition, in order to better deal with the measurement data and save measurement results, the measuring instrument serial communication interface is designed to follo