摘要：随着电子技术的发展，智能家居应运而生。本设计所实现的温控风扇可以根据环境温度自动调速，不仅省电，而且方便了人们的生活，极具智能性。因此，研究自动调温风扇显得很有必要。本设计采用数字温度传感器DS18B20作为温度采集元件，采集到的数字温度送给AT89C52单片机处理，处理后的信号通过两个三极管驱动直流风扇电机。配以按键电路，显示电路，声响电路，实现温度采集，PWM调速，风扇驱动，显示，按键设置，声响控制等功能。实验结果表明，用户可自行设置高、低预设温度值。当测得温度在高低预设温度之间时风扇自动切换为弱风档；当测得温度超过最高预设温度时风扇自动切换到大风档；当测得温度低于最低预设温度时风扇自动关闭。验证了该设计的可行性。74585

毕业论文关键词：AT89C52，DS18B20，温控风扇

Abstract: With the development of electronic technology, “smart home” becomes an emerging industry。 The speed of the temperature controlled electric fan can be adjusted automatically according to temperature。 The design can not only save power resources, but also greatly facilitate people's life。 It is highly intelligent。 Therefore, it is very important to research automatic temperature controlled fan。 In the design, digital temperature sensor DS18B20 was used as temperature acquisition element。 After the temperature being processed by the single chip computer AT89C52, the DC fan motor was driven by two transistors。 With a key circuit, a display circuit, and a sound circuit, the design realized the acquisition of temperature, the PWM speed adjustment, the drive of fan, the display of digital tubes, the setting of keys, and the control of sound, etc。 Users can set high and low temperatures by themselves。 When the measured temperature value is between the high and low temperature, open the weak windshield of fan; when the temperature exceeds the high temperature, automatically switch to the strong windshield; when the temperature is lower than the set temperature, automatically turn off the fan。 Then the feasibility of the design is verified。

Keywords: AT89C52, DS18B20, temperature controlled fan

目   录

1  绪论 4

1。1  研究目的和意义 4

1。2  发展现状与趋势 4

1。3  本系统实现功能 4

2  整体方案设计 5

2。1  总体设计 5

2。2  方案论证 5

3  硬件电路设计 7

3。1  系统整体结构 8

3。2  元器件简介 9

3。3  各模块电路设计 17

4  系统软件设计 23

4。1  软件介绍 23

4。2  软件设计流程图 25

5  系统调试 29

5。1  调试过程出现问题及解决措施 29

5。2  最高预设温度的调节与显示（按键伴有声响） 30

5。3  最低预设温度的调节与显示（按键伴有声响） 31

5。4  实际温度与档位的显示（按键伴有声响） 33