简易电子闹钟的设计报告
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基础工程设计说明书
题 目：LED强度可调驱动电路设计
院 （系）： 电子工程与自动化学院
专 业： 光电信息科学与工程
学生姓名： ***
学 号： **********
指导教师： ***
职 称： 高级实验师
2017年 1 月1日桂林电子科技大学基础工程设计说明书
摘 要
目前，LED 灯的亮度可调通过有两种可行方案：第一种是通过占空比电压来输出不同的电压，从而实现亮度可调；第二种通过控制数模转换器来输出不同的电流，然后经过放大器来进行发大，从而实现输出不同的电压，来实现亮度可调。对于第一种方案，优点是设计简单，且使用的电子器件类较少，造价成本低，其集成度低，电路原理不复杂，适于现代社会发展的需求。对于第二种方案，它设计图复杂，其集成度不高，且使用了数模转换器，因此和第一种设计方案相比略高。所以本设计采用了第一种方案。 本设计的结果是设计制作一种路LED光强独立可调的 led 调光电路；自动调光时可使 等在熄灭、微亮、较量及最亮四种状态中不断循环；实现灯光的循环调节功能(循环时 间分别为为 2s、4s、6s、8s、10s、12s)；
关键词：LED；色温；RGB；驱动；调光
桂林电子科技大学基础工程设计说明书
Abstract
At the end of twentieth Century, the electronic technology has developed rapidly. In the
promotion, the modern electronic products have penetrated almost all areas of the society. It has greatly
promoted the development of social productive forces and the improvement of social information. Time is
always so valuable to people, the work of the busy and complicated and easy to make people forget the
current time. Forget to do, when it is not very important, this not hurt the important essentials. Simple
electronic alarm clock is a used to after a certain period of time through the alarm sounds and wakes up the
user a simple electronic circuit and is used to prevent nap sleep overdo the instrument from time to time to
wake up the user's role. This system mainly consists of 555 timer square wave signal generator and the
input control through the key input control of the two bit counter timing circuit can be input to the input of
a time of the electronic clock, simulation and time interval can be within 99 seconds of continuous
adjustable.
Key words: timing circuit; 555 timer; multi harmonic oscillator; time clock
桂林电子科技大学基础工程设计说明书
目 录
引言 ................................................................................................................................................................. 1
1 设计任务 ................................................................................................................................................... 2
1.1 设计题目 .......................................................................................................................................... 2
1.2 设计要求 .......................................................................................................................................... 2
2 系统的组成 ............................................................................................................................................... 3
2.1 系统的组成总体框图 ...................................................................................................................... 3
2.2 各部分系统的功能 .......................................................................................................................... 3
2.3 方案可行性分析与仿真调试 .......................................................................................................... 3
2.3.1时钟信号发生系统 ................................................................................................................ 3
2.3.2按键输入系统 ........................................................................................................................ 5
2.3.3 倒计时与响铃系统 ............................................................................................................... 6
2.3.4各系统的衔接与总原理图 .................................................................................................... 9
3 硬件设计 ................................................................................................................................................. 10
3.1 元器件选择的依据以及元件参数的确定 .................................................................................... 10
3.2 PCB原理图与电路图布线设计 ................................................................................................. 10
3.3硬件制作 ......................................................................................................................................... 11
4 系统调试 ............................................................................................................................................... 12
4.1 信号发生器的调试 ........................................................................................................................ 12
4.2 计数器以及数码管显示的调试 .................................................................................................... 12
4.3 响铃系统调试 ................................................................................................................................ 12
4.4 按键输入电路的调试 .................................................................................................................... 12
