环境温湿度光照检测装置：STC89C52单片机实时监测与显示系统

The purpose of this research project is to provide people with an instrument that can real-time monitor the quality of their environment, including temperature, humidity, and illuminance, allowing individuals to be informed and make necessary adjustments accordingly. This paper utilizes the STC89C52 microcontroller as the control core to achieve the detection of temperature, humidity, and illuminance, as well as the design of the LCD real-time display circuit. The implementation of its functions mainly relies on software programming, which reduces the complexity of hardware circuits, lowers costs, and enables the completion of tasks that are difficult to achieve with complex hardware circuits. Equipped with advanced micro low-power sensors, the temperature sensor is 18B20, the humidity sensor is DHT11, and the illuminance sensor is TSL2561, enabling the acquisition, storage, and display of environmental temperature, humidity, and illuminance intensity. Additionally, this system also features an alarm function; when the data collected by the sensors is outside the range set by the user, a buzzer will sound to alert the user. The system is reliable, with a simple structure and high cost-effectiveness. Keywords: STC89C52 microcontroller, temperature and humidity, illuminance, liquid crystal display, alarm.