一种湿度检测电路的设计

Design of Humidity Detection Circuit

湿度是工农业生产和人民日常生活非常重要的环境因素,为了达到稳定、高亮度和快速的显示,采用电容式湿度传感器和单片机结合的方法设计了湿度检测电路,给出了传感器、单片机、A/D转换、显示等元器件和单元电路选择和设计的依据。检测时,湿度传感器HM1500感受湿度变换成电信号送ADC0809转换后经单片机C51处理,由MAX7219控制显示。检测电路具有原理清楚、结构简单、灵敏度高、稳定性好以及高亮度数码显示等特点。

Humidity is an important environmental factor for industrial and agricultural production and people′s daily life,in order to achieve fast and stable high brightness display,the method of combining capacitive humidity sensor and microcontroller was used to design humidity detection circuit.The sensor,microcontroller,A / D conversion,display circuit components and modules based on selection and design are proposed.In the process of detecting,the humidity sensor HM1500 converted the humidity signal into electrical signals,which were sent to ADC0809 and processed by C51,then displayed by MAX7219.Detection circuit has characteristics of clear principle,simple structure,high sensitivity,good stability,high brightness digital display and so on.