格式模板(定稿高丹)一种基于USB语音播报温湿度计.docVIP

单位代码： 分 类 号： 延安大学西安创新学院 本科毕业论文（设计） 题 目 一种基于USB的 语音播报温湿度计 专 业： 名： 黄 同 职 称： 二零一三年六月 一种基于USB的语音播报温湿度计 摘要：在众多环境因子中温湿度因子是比较重要的环境因子，本文设计了一种基于单片机的温湿度测量系统，本系统具有一定通用性。本设计采用功能强大，价位低廉的STC89C52单片机。控制芯片采用技术成熟的DHT11芯片作为测量温度和湿度的传感器，由于DHT11自带A/D转换，使电路大大简化。采用集成芯片OTP语音芯片作为语音播报系统控制芯片，大大简化了电路设计和方法设计。显示方面采用的是微功耗、体积小、显示内容丰富、超薄轻巧的液晶显示器DHT11芯片；USB. A USB based voice broadcast thermometer and hygrometer Abstract：In a number of environmental factors in temperature and humidity factor is more important environmental factors, we design a microcontroller-based temperature and humidity measurement system, the system has a certain versatility. The design uses a powerful, low price STC89C52 microcontroller. Control chips using mature technology the DHT11 chip as a sensor for measuring the temperature and humidity, since the the DHT11 comes with A/D conversion, so that the circuit is greatly simplified. Chip OTP voice chip as a voice broadcast system control chip, greatly simplifying the circuit design and methods of design. The display used micro-power, small size, content-rich, ultra lightweight 1602 liquid crystal display. In addition, taking into account the factors of energy saving and environmental protection, the design uses a USB-powered. By the design of a temperature and humidity detection system has the advantages of simple structure, wide measuring range, high reliability, safety and practicality of higher. Keywords: 1602 LCD; OTP voice chip; STC89C52 microcontroller; DHT11 chip; USB. 目录 1引言 1 2系统硬件设计 1 2.1系统指标要求及工作任务 1 2.2系统设计方案选择 2 2.3系统工作框图 3 2.4系统工作原理 4 2.5 STC89C52单片机 4 2.5.1 晶振回路 5 2.5.2 复位电路 5 2.6 温湿度测量电路的设计 6 2.6.1 DHT11介绍 6 2.6.2 DHT11的工作原理 6 2.6.3 DHT11的传输特性 9 2.6.4 温湿度测量电路设计 10 2.7 1602液晶显示电路设计 11 2.8语音播报电路设计 13 2.8.1 OTP NY3P035AP8语音芯片介绍 13 2.8.2管脚分布 13 2.8.3 功能说明 14 2.8.4 输