电路以湿度检测电路为核心，按功能可划分为：湿度检测电路、湿度报警电路、湿度控制电路三部分。湿度检测电路主要通过模拟湿度传感器得到所测的相对湿度与输出电压的线性关系，再通过AD转换器将相对湿度显示出来；湿度报警电路是通过电压比较器将设定的上限和下限的值所对应的电压与输出电压比较，若比较器输出高电压则引发报警；湿度控制部分是通过电压控制继电器从而控制加湿器的工作。(The circuit uses humidity detection circuit as the core, and can be divided into three parts: the humidity detection circuit, the humidity alarm circuit and the humidity control circuit. Humidity detection circuit mainly by the linear relationship between the simulated humidity sensor obtained by measuring the relative humidity and the output voltage, and then through the AD converter will show relative humidity; humidity alarm circuit through the voltage comparator voltage and the output voltage of the upper and lower limit setting values of the corresponding comparison, if the comparator output high voltage trigger alarm; the humidity control part through a voltage control relay to control the humidifier work.)