介绍了基于LPC2378微控制器的pH水质分析仪的研制,进行了硬件设计和软件设计,硬件设计包括总体方案、信号采集、继电器输出、4～20 mA模拟量输出等电路,软件设计详细讨论了软件控制策略和滤波、参数标定、测量值计算等数据处理方法.该分析仪样机达到如下技术指标:pH值测量范围0～14,分辨率0.01,精度±0.05,检测速度500ms.仪器使用方便,运行可靠、稳定,具有广泛的应用价值.%The research and design of the pH water quality analyzer based on LPC2378 microcontroller was introduced,including the design of hardware and software. The hardware design included the whole scheme, the signal acquisition, the relay output and the analog output circuit from 4 mA to 20 mA,etc. In the software design,the control strategy and the filter,the parameter calibration, the calculation of measurement value were discussed in detail. The prototype of this analyzer has achieved the flowing technical index,pH value full scale from 0 to 14,resolution 0. 01,accuracy ±0. 05,response speed 500 millisecond. It proves that the analyzer runs reliably and can be used conveniently and worth to be applied widely.
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