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介绍了一种以单片机为核心构成的水位传感器专用频率计．该频率计直接用单片机的计数器对水位传感器的频率脉冲计数，从而实现频率的检测．该频率计具有结构简单、价格低、精度高等特点．
This paper introduces a kind of frequency meter specially designed for water level sensor based on singlechip. The frequency meter directly with the microcontroller counter to the frequency of the water level sensor pulse count in order to achieve the detection of the frequency. The frequency meter has the advantages of simple structure, low price and high precision.