摘要本次设计的目标是做一个数字湿度计。本次设计的核心芯片是51单片机中的STC89C52以及DHT11温湿度传感器，本次设计只用到DHT11D的湿敏电阻部分。STC89C52单片机虽然也是属于一款传统的51单片机系列，但在芯片上坐了很多的改进，新增了EEPROM空间，支持串口写程序，非常便易快捷。而且STC89C52也是一款运用非常普遍的单片机，在工业检测控制，仪表仪器等方面都有着较大的贡献，用于检测湿度的列子也是相当普遍。另外，STC89C52单片机也是我们比较熟悉且较容易掌握的一款基础的单片机。77653

DHT11是一款数字信号输出的温湿度传感器，而且采用的单线制串行接口便于电路设计连接，无需A/D转换电路。同时DHT11正好能与八位单片机STC89C52相连接。此湿度传感器本身具有功耗低，抗干扰能力强，性价比高等优点。

利用STC89C52单片机以及DHT11温湿度传感器能够很好的完成本次设计的任务，及对于湿度的检测。本次设计的湿度计反应灵敏，数字显示直观，同时兼具报警的功能。

该论文有图11幅，表5个，参考文献10篇。

毕业论文关键词： 湿度计  DHT11  STC89C52 

The smart car based on Electromagnetic Tracking

Abstract   The goal of this design is to make a digital thermometer。 The core chip of this design is the STC89C52 and the DHT11 temperature and humidity sensor in the 51 single chip microcomputer, this design only uses the humidity sensitive resistor of DHT11D。 STC89C52 microcontroller, although it is a traditional 51 microcontroller series, but on the chip to sit a lot of improvement, the new EEPROM space to support the serial program, very easy to fast。 And STC89C52 is a use very common MCU, detection in industrial control, instrumentation and other have greater contribution for humidity detection of Liezi is also quite common。 In addition, STC89C52 is also more familiar with us and more easily grasp the basis of a single chip。

DHT11 is a digital signal output temperature and humidity sensors, and the use of a single wire system serial interface to facilitate the design of the circuit connection, without the need for A/D conversion circuit。 At the same time, DHT11 can be connected with the eight bit MCU STC89C52。 The humidity sensor has the advantages of low power consumption, strong anti-interference ability and high cost performance。

The use of STC89C52 MCU and DHT11 temperature and humidity sensors can be very good to complete the task of this design, and for the detection of humidity。 The design of the humidity meter sensitive, digital display intuitive, while both the alarm function。

This paper has 11 figures, 5 tables, 10 references。

Key words: Moisture meter  DHT11  STC12C5A60S2

目 录

摘要： I

Abstract II

目录 III

图清单 IV

表清单 IV

1 绪论 1

1。1选题背景和依据 1

1。2 湿度计的发展趋势 1

    1。3 主要工作内容 2

2 湿度计的方案设计 3

2。1主控芯片方案 3

2。2 湿度传感器的选择方案 7

2。3显示器方案 9

3 湿度计详细设计 10