温控风扇系统设计：基于单片机，智能温度感测与控制。

摘要： 本文介绍了一种基于单片机的温控风扇系统设计。该系统具有温度感测和显示功能，使用AT89C52单片机控制风扇转速。用户可以设置高、低温度值，当测得温度在这一范围内时，风扇会以弱风速运行；当温度超过设定值时自动切换为大风速，低于设定温度时自动关闭风扇。控制状态根据外界温度变化而调整。高低温值保存在温度传感器DS18B20内部的ROME2中，即使掉电，仍能保存上次设置值，保持性能稳定、控制准确。 关键词：自动控制、单片机、温度控制 Abstract: This document introduces a design of temperature controlled fan system based on single chip microcomputer. The system is equipped with temperature sensing and display functions, and uses AT89C52 microcontroller to control the fan speed. Users can set high and low temperature values. When the temperature is within this range, the fan operates at a low speed; when the temperature exceeds the set value, it automatically switches to high speed, and automatically turns off the fan when the temperature is below the set temperature. The control status is adjusted according to the external temperature changes. The high and low temperature values are stored in the ROME2 of the temperature sensor DS18B20, even if power failure occurs, the last set value can still be retained, ensuring stable performance and accurate control. Keywords: automatic control, single-chip microcomputer, temperature control