基于单片机与数字传感器DHT11，设计了一种简易的温湿度测控系统。分析了DHT11的内部结构、时序和工作原理，提出了采用74 L151实现8路切换式多点测量的方法，设计了数字传感器、键盘、LCD液晶显示器和数据选择器与单片机的接口电路。结合硬件给出了测量系统的程序流程。通过室内温湿度模拟实验，得出系统的线性度为1．5％；重复性：湿度为2％RH，温度为1℃；精度：湿度±2％RH，温度±1．5℃；分辨率：湿度1％RH，温度1℃。%Based on both MCU and DHT11 digital sensor, a simple temperature and humidity measurement and control system was designed;and DHT11 digital sensor’s internal structure, timing sequence and working principle were analyzed to propose the method of employing 74L151 to realize 8-way multi-point detection and to design an in-terface circuit between the MCU and the digital sensor , keyboard, LCD liquid crystal display and the data selector , considering the system hardware , the software program flow chart was presented .Simulation experiments on indoor temperature and humidity brings a 1.5%linearity, a 2%RH humidity and 1℃in repeatability, and a ±2%RH hu-midity and ±1.5℃in precision, as well as a 1%RC humidity and 1℃in resolution.
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