一个基于AT89C51单片机设计的温湿度计，应用了SHT11温湿度传感器，除了最简单的温湿度测量，电路还可以通过按键设置温湿度阈值，并添加了超声波雾化器，当湿度超过阈值时，超声波雾化器工作，自动加湿环境。-One based on AT89C51 microcontroller design hygrometer, temperature and humidity sensors SHT11 applied, but the simplest humidity measurement circuit can also be set through the key threshold of temperature and humidity, and adds ultrasonic nebulizer, when the humidity exceeds the threshold, the ultrasonic atomizer work, auto humidity environment.