摘要 本文以工厂环境温湿度为例进行数据采集,设计出以STC12C5A60S2单片机为主体的数据采集系统,整个系统的由以下几个模块组成:
第一是温湿度采集模块,选用了数字式DHT21传感器。其特性是由单总线输出采集信号传送给用户主机,再将信号进行处理经SPI口发射出去。
第二是无线传输模块,分为数据发射和接收,选用nRF905作为主控芯片实现模块功能。利用这种芯片的收发特性和一些性能参数,实现无线传输功能。
第三是数据显示模块,选用1602LCD数字显示器把处理好数据包信号直观的显示出数字符号。72714
本系统以STC12C5A60S2为核心,建立温湿度采集系统,实时对温湿度的的无线传输。此系统不仅节约空间,工程造价低而且稳定性良好,低功耗,非常适合室内环境,并且有较好的应用市场。
该论文有图14幅,表11个,参考文献20篇。
毕业论文关键词: DHT21传感器 单片机 无线传输
The Design of Data Acquisition and Wireless Transmission System
Abstract This article is based on the factory environment of temperature and humidity for the direction of data acquisition, to design a microcontroller as the main STC12C5A60S2 wireless acquisition system, the whole system consisting of the following modules。
The first is the temperature and humidity acquisition module, use the digital DHT21 sensor。 The characteristics of a single-bus output signal is transmitted to the hosts collected and then processed by the signal emitted SPI port。
The second is the wireless transmission module is pided into data acquisition and reception, use nRF905 chip module functions as a master。 With this chip transceiver characteristics and some performance parameters, wireless transmission function。
The third is the data display module, use 1602 LCD digital display to handle packet signal visually show numeric symbols。
This system STC12C5A60S2 as the core, the establishment of temperature and humidity acquisition system, real-time temperature and humidity data acquisition。 This system not only saves space, low construction cost and good stability, low power consumption, ideal for the indoor environment, and better applications。
Keywords: DHT21 sensor microcontroller wireless transmission
目录
摘要 I
Abstract II
目录 III
图清单 V
表清单 V
1 绪论 1
1。1 论文选题的背景和意义 1
1。2 数据采集技术的发展现状 1
1。3 无线通信技术简述 2
1。4 论文的主要内容 2
2 系统的总体方案设计 4
2。1 系统的总体设计的基本思想 4
2。2 系统总体架构 4
2。3 系统方案的主要任务 6
3 系统器件的选型 7
3。1 单片机的选型 7
3。2 温湿度传感器的选型 11
3。3 无线模块器件选择方案