无线通讯自动档测温系统的设计  

Design of Ireless Communicational Automatic Temperature Measurement System

作　　者：卢珍 LU Zhen(Guangzhou City University of Technology,Guangzhou 510800)

机构地区：[1]广州城市理工学院,广州510800

出　　处：《计算机与数字工程》2021年第12期2659-2664,共6页Computer & Digital Engineering

摘　　要：为了实现远距离高精度多路测温,设计了以C8051F340单片机为核心,基于AD595芯片,并搭建信号处理电路,利用HC-06无线蓝牙模块实现远距离传输的测温系统。提出了利用加法电路将测温范围内最低电压信号调整至零伏,针对零下温度信号,使负电压信号变为正电压信号,避免AD转换所需分配的符号位,把原有的符号位变成了数字位,使数模转换后的数字量化位数增加,量化精度提高,实现高精度的温度采集,并结合多路选择分压电路将系统的测温范围分为三个档位,进一步提高了测温系统的采集精度和实现温度测试范围的可调控性。提出了对AD595温度-电压分度表进行分段多方法拟合,得出标准差最小的拟合公式,实现准确的电压-温度转换。实验表明无线传输数据较为稳定,温度测试结果精度高,系统可靠性好,满足设计要求。In order to realized high precision and multi-channel temperature measurement,based on the AD595 chip,a par⁃ticular measurement system is designed with the C8051F340 microcontroller as the core,in which the signal processing circuit is constructed and the HC-06 wireless Bluetooth module is used for long-distance transmission.The lowest voltage signal of tempera⁃ture measurement range is adjusted to zero by means of addition circuit.Thus,for the signals of negative temperatures,the negative voltage signals are transferred into positive ones to avoid the symbol bit required by the AD convert.The original symbol bit is trans⁃ferred into digital bit so that the digit bit after the AD convert is increased in digit and the quantization precision is therefore im⁃proved,the high precision temperature acquisition is achieved.The temperature measuring range of the system is divided into three gears by the multi-way selective voltage dividing circuit.In this way,the acquisition accuracy of the temperature measurement sys⁃tem is further improved and the control of the temperature measurement range is realized.The AD595 temperature-voltage index ta⁃ble is fitted segmentally with multiple methods so as to obtain the fitting formula of the minimum standard deviation and achieve ac⁃curate transition between voltage and temperature.According to the experimental results,the wireless transmission data is stable,the temperature test results are accurate,and the system is of high reliability.Therefore,the design requirements are satisfied.

关 键 词：AD595 无线通讯 自动挡测温 C8051F340控制 电压 

分 类 号：TP352[自动化与计算机技术—计算机系统结构]