带温度显示的电子闹钟设计说明

题目：带温度显示的电子闹钟设计

摘要

本文设计了一款利用单片机技术实现带温度显示的电子闹钟。以应用AT89C51芯片作为核心，利用8位LED数码管显示，使用DS1302实时时钟日历芯片完成时钟/日历的基本功能，同时利用DS18B20温度传感器测量环境温度。这种实现方法的优点是电路简单，性能可靠，实时性好，时间和温度精度高，操作简单，编程容易。

关键词：电子闹钟,温度,AT89C51,DS18B20,DS1302

Abstract

The design determines to use the MCU technology to realize the multi-functional electron clock. This design use AT89C51 as a core chips, 8 LED digital displaying. using DS1302 real-time clock chip to complete the basic function of the clock/calendar.At the same time the design use of DS18B20 temperature sensors is for collecting the environmental temperature. The method has the advantage of being simple circuit, reliable performance, good real-time, high precision of the time and temperature, simply operation, easy programming.

Key words: Electronic clock,Temperature,AT89C51,DS18B20,DS1302

目录

1 绪论................................................................... .. (1)

1.1 引

言...............................................................

(1)

1.2 电子时钟研究背景和意

义...............................................................

(1)

1.3论文主要工作概述................................................................. . (1)

2 系统设计方案................................................................... . (2)

2.1带温度显示的电子闹钟系统的总体构成 (2)

2.2带温度显示电子闹钟系统的功能................................................................. .3

3 系统硬件计................................................................... .. (4)

3.1主要IC芯片选择................................................................. (4)

3.1.1 微处理器选

择................................................................... . (4)

3.1.2 芯片DS1302简介................................................................... (5)

3.1.3 环境温度传感器................................................................... (6)

3.2 电子时钟的硬件电路设计................................................................... . (8)

3.2.1时钟电路设

计...............................................................

(8)

3.2.2环境温度采集电路设

计...............................................................

(8)

3.2.3显示电路计................................................................. (9)

3.2.4按键电路设

计...............................................................

(10)

3.2.5闹铃电路设

计...............................................................

(11)

4 系统软件设计................................................................... .. (12)

4.1主程序计................................................................. (12)

4.2子程序设

计...............................................................

(12)

4.2.1实时时钟日历子程序设

计...............................................................

.12

4.2.2环境温度采集子程序设

计...............................................................

.13

4.2.3显示子程序设计................................................................... . (16)