基于OneNET云平台的pH在线检测仪
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摘要
为了提高pH值监测的实时性和测量精度,设计了一种基于OneNET云平台的pH在线检测仪。该检测仪采用STM32作为微处理器,设计有前端高阻抗输入电路模块、非接触式红外测量温度传感器和16位A/D转换电路。信号处理采用模拟滤波器和数字滤波器相结合的方式,避免了采用设计难度大的模拟高阶滤波器,同时兼顾了信号滤波效果。针对pH值测量易受温度影响而导致测量精度下降的问题,采用电化学能斯特方程(Nernst)对pH测量值进行温度补偿。该检测仪可实现带温度补偿自动测量、本地数据存储、实时测量显示,并利用ESP8266 WIFI模块将数据远程传输到OneNET云平台,凭借OneNET开放、海量数据存储以及完善的开发工具等优势,实现基于OneNET云平台的pH在线检测仪,能够适应未来环境监测领域中物联网应用的趋势。
In order to improve the real-time performance and accuracy of pH monitoring,apH detector based on OneNET cloud platform is designed.The detector uses STM32 as a microprocessor,the design has a front-end high-impedance input circuit module,infrared thermometer for non-contact temperature sensor and 16-bit A/D conversion circuit.Signal processing combines analog filters with digital filters to avoid the design of high-order filters and takes into account the signal filtering effect.In addition,pH value is easily affected by the temperature and the measurement accuracy is reduced,pH value is compensated by using Nernst electrochemical method.The detector can be automatically measured with temperature compensation,local data storage,real-time measured display,and ESP8266 WIFI module is used to remotely transmit data to the OneNET cloud platform.With the OneNET open cloud platform,massive data storage and perfect development tools and other advantages,apH online detector based on OneNET cloud platform is realized.
In order to improve the real-time performance and accuracy of pH monitoring,apH detector based on OneNET cloud platform is designed.The detector uses STM32 as a microprocessor,the design has a front-end high-impedance input circuit module,infrared thermometer for non-contact temperature sensor and 16-bit A/D conversion circuit.Signal processing combines analog filters with digital filters to avoid the design of high-order filters and takes into account the signal filtering effect.In addition,pH value is easily affected by the temperature and the measurement accuracy is reduced,pH value is compensated by using Nernst electrochemical method.The detector can be automatically measured with temperature compensation,local data storage,real-time measured display,and ESP8266 WIFI module is used to remotely transmit data to the OneNET cloud platform.With the OneNET open cloud platform,massive data storage and perfect development tools and other advantages,apH online detector based on OneNET cloud platform is realized.
引文
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[7]孙忠祥.基于设备云平台的智能农业温室大棚远程监控系统的实现[D].哈尔滨:哈尔滨理工大学,2017(3):28-30.
[8]范兴隆.ESP8266在智能家居监控系统中的应用[J].单片机与嵌入式系统,2016,16(9):52-56.
[2]赵小强,冯勋.基于ZigBee的水质pH值在线监测系统[J].西安邮电大学学报,2014,19(6):71-75.
[3]刘海,杨慧中.一种智能在线pH检测仪[J].江南大学学报,2012,11(2):174-177.
[4]侯杰林,张青春,符骏.基于OneNet平台的水质远程监测系统设计[J].淮阴工学院学报,2016,25(3):11-13.
[5]康华光.电子技术基础:模拟部分[M].5版.北京:高等教育出版社,2006:430-432.
[6]吕登峰.基于ARM的水质pH检测系统设计与实现[D].西安:西安电子科技大学,2015-12:5-11.
[7]孙忠祥.基于设备云平台的智能农业温室大棚远程监控系统的实现[D].哈尔滨:哈尔滨理工大学,2017(3):28-30.
[8]范兴隆.ESP8266在智能家居监控系统中的应用[J].单片机与嵌入式系统,2016,16(9):52-56.