通过调节一个可变电阻得到变化的电压来模拟一个湿度度传感器，Led显示显示当前采集到的湿度值。另外设置四个按键，通过按键可以调整系统的参数设置。当湿度值高于湿度上限或者低于湿度下限时，报警灯会亮。当湿度值小于目标湿度并且不在比例调节范围时，系统输出高电平，湿度加湿器将全负荷工作，当湿度达到比例调节范围时，系统输出PWM脉冲，湿度加湿器将时断时续的工作，以保证逐步达到目标湿度值。最终实现一个闭环的智能湿度控制仪-By adjusting a variable resistor to be changes in the voltage to simulate a humidity sensor, Led display shows the current value of collected humidity. Another set of four buttons, keys can be adjusted through the system parameter setting. When the humidity is higher than the value of humidity humidity ceiling or below the limit, alarm lantern light. When the humidity is less than the target and not the proportion of humidity adjustment range, the system output high, humidity humidifier will work at full capacity, when the humidity reached the proportion of adjustment range, the system output PWM pulse, humidity will be intermittent humidifier work to ensure that humidity and gradually achieve the target value. The eventual realization of a closed-loop intelligent humidity control instrument