摘要：在生活中，我们几乎每天都能接触到与温度相关的各种设备。比如，夏天天气炎热，人们都使用风扇来作为避暑的良药。但有些地区白天与晚上温差很大，白天温度很高，而到了晚上气温降低。风扇虽然可以调节档位减小转速，但必须人为的去更换档位，晚上睡着后更无能为力了。还有如果是单纯的只有定时关闭风扇的功能也不能满足气温变换对风速大小的不同要求。所以本文就设计了基于单片机（STC89C52RC）的温控风扇系统，用单片机（STC89C52RC）作为控制系统，温度传感器（DS18B20）作为测温系统。温度传感器测出的温度与系统设定的温度进行比较并实现风扇的自动开启和停止，并根据温度的数值改变风扇的转速，同时利用5641BS数码管显示测出的温度和设定的温度。预调温度的设定通过两个按键完成，分别增大与减小温度。91917

毕业论文关键词：STC89C52RC，5641BS数码管，温度传感器

Abstract ： In our daily life, we are exposed to a variety of devices related to temperature almost every day。For instance,In summer, the weather is hot, people use the fan as a good medicine for summer。But in some areas the temperature difference between day and night is very large, the temperature is very high during the day, and in the evening the temperature decreases。Although you can adjust the speed of the fan to reduce the speed, but it is necessary to replace the stalls artificially, and then fell asleep at night can do nothing。On the other hand, only the timing of the fan can not meet the functional requirements of the temperature   change

on the size of the wind speed。Therefore, this article has designed based on the monolithic integrated circuit (STC89C52RC) the temperature control fan system, uses the monolithic integrated circuit (STC89C52RC) as the control system, the temperature sensor (DS18B20) takes the temperature measuring system。To set the temperature and the temperature detected by a temperature sensor system of the automatic start and stop and realize the fan, and according to the value of the temperature change of the rotational speed of the fan, and the use of 5641BS digital tube display of the measured temperature and the set temperature。Preset temperature setting through two keys, respectively, increase and decrease temperature。

Key words:STC89C52RC，5641BS Nixie tube，temperature sensor

目 录

第1章绪论 5

1。1研究本课题的目的和意义 5

1。2发展现状 5

第2章系统硬件组成 6

2。1系统结构 6

2。2主控芯片介绍 6

2。2。1STC89C52RC简介 6

2。2。2STC89C52RC单片机引脚说明 8

2。2。3STC89C52RC单片机最小系统 10

2。3DS18B20温度采集电路 11

2。3。1DS18B20的特点及内部构造 12

2。3。2引脚功能介绍 13

2。3。3DS18B20的工作原理 14

2。4数码管驱动显示电路 16

2。4。1数码管驱动电路 16

2。4。2数码管显示电路 17

2。5风扇驱动电路 17

2。6按键模块 18

第3章系统软件设计