LED亮度自动调节系统设计.doc

摘要 1 关键词 1 英文摘要 1 英文关键词 1 1 引言 2 1.1 选题背景 2 1.2 实现功能 2 1.3 技术路线 2 2 方案选择 3 2.1 系统总体方案的选择 3 2.3 系统框图 3 3 硬件电路设计 4 3.1 主控模块 4 3.1.1 单片机芯片 4 3.1.2 复位电路 5 3.1.3 时钟电路 6 3.1.4 系统按键电路 7 3.2 光信息采集及A/D转换模块 8 3.2.1 光电转换电路 8 3.2.2 A/D转换电路 9 3.3 LED亮度调节模块 11 3.4 电源模块 12 4 软件设计 13 4.1 系统程序开发软件简介 13 4.2 系统总流程图 14 4.3 光强判断流程图 15 5 系统调试 16 5.1 调试 16 5.1.1 硬件调试 16 5.1.2 软件调试 16 5.1.3 整体调试 16 5.1.4 操作指南 17 6 结束语 17 6.1 总结 17 6.2 体会 17 参考文献 18 附录 19 Abstract: In todays world, pollution, shortage of energy environment awakened people all over the world awareness of energy conservation and emission reduction, energy-saving lamps and shouldering the mission to environmental protection, energy saving and emission reduction of emerge as the times require and gradually recognized and received.LED is called the fourth generation lighting source or a green light, the light emitting device LED is a cold light source, has the characteristics of energy saving, environmental protection, long life, small volume and so on, is the future direction of development of energy-saving lighting.This paper designed an automatic dimming system of a STC89C52 microcontroller as the core to the brightness, the photosensitive sensor sensing external light intensity, SCM system based on data acquisition control LED open, to adjust the brightness of the light source,and the system also increases the manual control function to enhance the flexibility of system control.The system has automatic, energy saving, simple structure, low cost, stable and reliable work, has certain practical value in daily life Key Words:singlechip;A/D conversion; photosensitive resistance;LED 1 引言 随着现代社会的发展，能源消耗的加剧，高效的照明技术得到人们的广泛关注。LED以其高效率、低消耗、低电压驱动、使用寿命长等优点，越来越多的应用往各种照明场合，在可预见的将来可能完全取代传统的白炽灯、荧光灯照明，给照明产业带来革命性的变化[1]。在这一设计里我们将涉及到有关LED自动调节亮度的设计，这从原理上使我们对这一设计有了解。将其与我们切实地相联系起来。 1.1 选题背景 伴随着全球经济的迅速发展，能源消耗的不断加剧，带来的的则是大量的环境污染和生态破坏，绿色节能已经成为全球普遍关注的话题，人们正通过各种途径寻找新的节能方式[1]。在电能消耗中，照明用电占发电总量的比例：发达国家是19%，我国现今达到12%。可以预知的是