使用AT89S51单片机测湿度。湿度传感器：HS1101。传感器电容随湿度改变，利用555产生方波。在最小系统版上实现。保证好用。-Humidity measurement using the AT89S51 microcontroller. Humidity Sensor: HS1101. With the humidity sensor capacitance changes produced by 555 square wave. To achieve the minimum system