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Description: 利用热电偶转换器的单片机温度测控系统原理及应用部结构图热电偶放大与数字转换器-Thermocouple converters using single-chip temperature measurement and control system theory and application of the Department of structural plans to enlarge thermocouple and digital converters
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Size: 1178624 |
Author: 金鹏 |
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Description: 一种基于AT89C51单片机的智能温度控制器，采用K型热电偶和专用冷端温度补偿芯片MAX6675构成温度测量电路，由MAX6675输出的数字信号直接送入单片机，一方面通过 LCD 将温度显示出来；另一方面，将该温度与设定的温度值进行比较，根据其偏差的大小，采用改进的数字PID算法对其进行处理得到控制信号，此信号经过D\A转换器DAC0832转换为模拟量输出0～5V。- kind of based on AT89C51 intelligent temperature controller, the K thermocouple and special type of the cold end temperature compensation MAX6675 constitute a temperature measurement circuit chip, MAX6675 output by the digital signal directly into the single chip microcomputer, on the one hand, through the LCD will display temperature On the other hand, will the temperature and setting value, compared the deviation according to the size of the digital PID algorithm of the improved the processing get control signal, the signal through D \ A converter DAC0832 into analog output 0 ~ 5 V.
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Size: 12288 |
Author: wangna |
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Description: MAX6675是可编程的K型热电偶A/D转换器，可以使用C汇编程序完成。MAX6675的输出数据为16位，其中D15始终无用且一直为零，D14～D3对应于热电偶模拟输入电压的数字转换量，D2用于检测热电偶是否断线（D2为1表明热电偶断开），D1为MAX6675的标识符，D0为三态。其转换结果与对应温度值具有较好的线性关系：温度值＝1023.75 转换后的十进制数/4096。
温度信号读取程序如下所示，程序中定义的ADH和ADL分别对应转换后的数据高4位和低8位。程序里面还附加了扫描D2位的子程序，若其为1，标志flag置1，返回相应的错误代码，显示何路出现断偶，这样做减少了热电偶检修的难度，具体采样与AD转换源程序如下-AX6675 is programmable K type thermocouple A/D converter, you can use C completed assembly program.
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Size: 72704 |
Author: 肖王 |
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