dht11传感器的使用代码，及其LCD显示的功能扩充。(DHT11 sensor code, and its LCD display features extensions.)

基于STM32F103C8T6单片机的环境检测系统，应用DHT11温湿度传感器，MQ135烟雾传感器，检测环境温湿度，烟雾，可燃气，检测到烟雾蜂鸣器报警，将实时数据显示在OLED屏上，且有按键可以修改报警值。(Based on STM32F103C8T6 microcontroller environment detection system, DHT11 temperature and humidity sensor and MQ135 smoke sensor are used to det