十字旋转屏报告 - 图文

旋转LED显示屏设计与测试

姓 名： 姜 x

学 号： 20112410212 班 级： （二） 专 业： 电子信息工程

一、实验任务

基于视觉暂留原理，设计一种旋转式LED显示屏，使其能够显示预设的文字，图案等。

二、显示原理

人眼在观察景物时，光信号传入大脑神经，需经过一段短暂的时间，光的作用结束后，视觉形象并不立即消失，这种残留的视觉称“后像”，视觉的这一现象则被称为“视觉暂留”。肉眼在24帧/秒以上就不会看到闪烁的，所以只要保证电机的速度能在一秒转24圈以上，这样的话人眼就觉得旋转的字很稳定很清晰的显示在空中了。

如果我们用电机带动led主板转动，以stc89c52单片机为控制中心，16个io口分别控制16个led，再加上一个红外发射管，一个红外接收管。led主板上的红外接收管每转动一圈红外接收管就会导通一次。一旦导通，单片机检测到引脚的低电平，便让单片机开始有规律的控制16个led的亮灭，这样，由于人眼的“视觉暂留”效应 ，便能看到显示屏上显示的文字或图像了。

要想准确显示一个字体或者图形，我们就要准确的给16个管脚赋上有规律的高低电平，要想知道怎样赋值，我们需要对文字或者图形取模，因为我们用的是16个led灯，所以我们取一个16*16的中文字，如图1示

图1 对汉字取模

从第一列开始向下每取8个点作为一个字节，如果最后不足8个点就补满8位。取模顺序是从低到高，即第一个点作为最低位。取模后数据如下：

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0xFF,0x7F,0xFF,0xBF,0x3F,0xC8,0xBF,0xFB,0xBF,0xFB,0xBF,0xEB,0x80,0x9B,0xB7,0xFB,0xB7,0xEB,0xB7,0x9B,0xB7,0xFB,0x37,0xF8,0xF7,0xEF,0xF7,0x1F,0xFF,0xFF,0xFF,0xFF,/*\点\

现在我们知道16*16取模是一列一列取的了，一列有2个字节，一共16列，所以一个16*16的汉字就有32个字节，需要占用单片机的Code空间 32个字节。 Led每旋转一周红外接收管接收信号时，单片机便开始根据取模后的数组开始依次点亮16个led。这样，便能显示文字或者图形了。

三、硬件设计

控制芯片采用STC89C52，结构框图设计如图2所示

图2 系统结构框图

本系统采用无线供技术。利用自激震荡电路，把5v直流电压转换成交流电压。然后通过线圈电磁感应，给led主板供电。电源电路原理图如图3所示

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电源 5V 电源 单片机STC89C52 直流电机 LED显示 红外接收管

图3 电源电路原理图

本系统用p2口，p4口，p5口控制16个led灯，次级感应线圈产生感应电压系统电路原理图如图4所示

图4 系统电路原理图

制作完成后，下载硬件测试程序进行测试，如果16个led灯能够全部点亮，

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则制作成功，可以作为显示屏使用，硬件测试程序见：六、程序

四、程序分析

本次实验采用查询方式编写程序，程序结构流程图如图5所示

图5 程序流程图

当程序开始运行的时候，首先就是要对程序进行初始化，主要作用就是让程

序按照我们所设计的初始值去运行。初始化之后，当显示屏旋转到接收到红外发射信号时，开始执行显示程序，有规律地点亮16个led灯。16个led及其对应引脚如图6所示

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FF,0xFF,

0xFF,0xFF,0xFF,0xFF,0x3F,0xF0,0xCF,0xE3,0xF7,0xCF,0xD7,0xDF,0x19,0xBF,0xBE,0xBE,

0x3E,0xBD,0x3E,0xBD,0xBE,0xBE,0x19,0xBF,0xD7,0xBC,0x7B,0x9B,0x7B,0x08,0x7B,0x6B,

0x7B,0x08,0x7B,0x9B,0xD7,0xBC,0x19,0xBF,0xBE,0xBE,0x3E,0xBD,0x3E,0xBD,0xBE,0xBE,

0x19,0xBF,0xD7,0xDF,0xF7,0xCF,0xCF,0xE3,0x3F,0xF0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,

0xFF,0xFF,0x3F,0xF0,0x0F,0xE0,0x07,0xC0,0x67,0x80,0x31,0x00,0x18,0x00,0x18,0x00,

0x18,0x08,0x10,0x18,0x21,0x13,0x87,0x24,0x83,0x66,0x83,0x66,0x83,0x64,0x83,0x66,

0x83,0x66,0x87,0x24,0x21,0x13,0x10,0x18,0x18,0x08,0x18,0x00,0x18,0x00,0x31,0x00,

0x67,0x80,0x07,0xC0,0x0F,0xE0,0x3F,0xF0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,

0xFF,0xFF,0xFF,0xFF,0x3F,0xF0,0x0F,0xE0,0x67,0xC0,0x97,0x80,0x11,0x01,0x20,0x02,

0x10,0x01,0x90,0x10,0x60,0x30,0x01,0x27,0xB7,0x68,0xB3,0x4E,0xB3,0xCE,0xB3,0xC8,

0xB3,0x4E,0xB3,0x6E,0xB7,0x28,0x01,0x37,0x60,0x10,0x90,0x00,0x10,0x01,0x20,0x02,

0x11,0x81,0x97,0xC0,0x67,0xE0,0x0F,0xE0,0x3F,0xF0,0xFF,0xFF,0xFF,0xFF,0xF

10

F,0xFF,

0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0xF0,0x8F,0xE7,0xE7,0xCF,0xF7,0x9F,0x39,0x3F,

0x3E,0x7F,0x3E,0x7F,0x3E,0x7F,0x3E,0x7F,0x39,0x63,0x37,0x5D,0xF3,0x45,0xFB,0x45,

0xFB,0x5D,0xFB,0x45,0xF3,0x45,0x37,0x5D,0x39,0x63,0x3E,0x7F,0x3E,0x7F,0x3E,0x7F,

0x3E,0x7F,0x39,0x3F,0xF7,0x9F,0xE7,0xCF,0x8F,0xE7,0x3F,0xF0,0xFF,0xFF,0xFF,0xFF,

0x7F,0xBF,0x77,0xDF,0x76,0xEF,0x71,0xF3,0x07,0xFC,0x73,0xFB,0x74,0xF7,0x77,0xCF,

0x7F,0xBF,0x77,0xDF,0x76,0xEF,0x71,0xF3,0x07,0xFC,0x73,0xFB,0x74,0xF7,0x77,0xCF,

0x7F,0xBF,0x77,0xDF,0x76,0xEF,0x71,0xF3,0x07,0xFC,0x73,0xFB,0x74,0xF7,0x77,0xCF,

0x7F,0xFF,0xFF,0xFF,0x01,0x00,0xFD,0xF7,0xDD,0xEF,0x25,0xF7,0xF9,0xF8,0xFF,0xFF,/*\郑\

0xFF,0x7E,0x1F,0xBF,0xFF,0xCF,0x00,0xF0,0xFF,0xFF,0xDF,0xFF,0x3F,0xFF,0xFF,0xFF,

0x01,0xC0,0xFF,0xFF,0xDF,0xFF,0x3F,0xFF,0xFF,0xFF,0x00,0x00,0xFF,0xFF,0xFF,0xFF,/*\州\

0xDF,0x7F,0xDF,0x7F,0xDF,0xBF,0xDF,0xDF,0xDF,0xEF,0xDF,0xF3,0xDF,0xFC,0x00,0xFF,

0xDF,0xFC,0xDF,0xF3,0xDF,0xEF,0xDF,0xDF,0xDF,0xBF,0xDF,0x7F,0xDF,0x7F,

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0xFF,0xFF,/*\大\

0xBF,0xFB,0xCF,0xFB,0xEE,0xFB,0x69,0xFB,0x6F,0xFB,0x6F,0xBB,0x6E,0x7B,0x69,0x81,

0x6F,0xF9,0x6F,0xFA,0x67,0xFB,0xEB,0xFB,0xEC,0xFB,0xAF,0xFB,0xCF,0xFB,0xFF,0xFF,/*\学\

0xFF,0xFE,0x7F,0xFF,0x9F,0xFF,0x07,0x00,0xF8,0xFF,0xFF,0xFF,0xFB,0xFF,0xDB,0x06,

0xDB,0xB6,0xDA,0xB6,0xD9,0xB6,0xDB,0xB6,0xDB,0xB6,0xDB,0x06,0xFB,0xFF,0xFF,0xFF,/*\信\

0xFF,0xBF,0xFF,0xCF,0xFF,0xFF,0x03,0xFC,0xAB,0xC6,0xAB,0xBE,0xA9,0xBE,0xAA,0xBA,

0xAB,0xA6,0xAB,0xBE,0xAB,0xBE,0x03,0x8C,0xFF,0xFF,0xFF,0xF7,0xFF,0xCF,0xFF,0xFF,/*\息\

0xFF,0xDF,0xFB,0xDF,0xFB,0xDF,0xFB,0xDF,0xFB,0xDF,0xFB,0xDF,0xFB,0xDF,0x03,0xC0,

0xFB,0xDF,0xFB,0xDF,0xFB,0xDF,0xFB,0xDF,0xFB,0xDF,0xFB,0xDF,0xFF,0xDF,0xFF,0xFF,/*\工\

0xDB,0xF7,0xDB,0xF9,0x5B,0xFE,0x01,0x00,0xDC,0xFE,0xDD,0xF9,0xFF,0xBF,0xC1,0xB6,

0xDD,0xB6,0xDD,0xB6,0xDD,0x80,0xDD,0xB6,0xDD,0xB6,0xC1,0xB6,0xFF,0xBE,0xFF,0xFF,/*\程\

0xBF,0xFB,0xCF,0xFB,0xEE,0xFB,0x69,0xFB,0x6F,0xFB,0x6F,0xBB,0x6E,0x7B,0x69,0x81,

0x6F,0xF9,0x6F,0xFA,0x67,0xFB,0xEB,0xFB,0xEC,0xFB,0xAF,0xFB,0xCF,0xFB,

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0xFF,0xFF,/*\学\

0xFF,0xFF,0x01,0x00,0xDD,0xFB,0xA5,0xF7,0x79,0xF8,0xEF,0x7F,0xF3,0xBE,0xDB,0xCE,

0xDB,0xF0,0xDA,0xFE,0xD9,0xFE,0xDB,0xC0,0xDB,0xBE,0xEB,0xBE,0xF3,0x8E,0xFF,0xFF,/*\院\

0xFF,0xFF,0xFF,0xFF,0x07,0xE0,0x77,0xF7,0x77,0xF7,0x77,0xF7,0x77,0xF7,0x00,0x80,

0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x07,0x60,0xFF,0x7F,0xFF,0x0F,0xFF,0xFF,/*\电\

0x7F,0xFF,0x7D,0xFF,0x7D,0xFF,0x7D,0xFF,0x7D,0xFF,0x7D,0xBF,0x7D,0x7F,0x1D,0x80,

0x5D,0xFF,0x6D,0xFF,0x75,0xFF,0x79,0xFF,0x7D,0xFF,0x7F,0xFF,0x7F,0xFF,0xFF,0xFF,/*\子\

0xFF,0xEF,0xFF,0xEF,0xF7,0xEF,0xF7,0xEF,0xF7,0xEF,0xF7,0xEF,0xF7,0xEF,0xF7,0xEF,

0xF7,0xEF,0xF7,0xEF,0xF7,0xEF,0xF7,0xEF,0xF7,0xEF,0xFF,0xEF,0xFF,0xEF,0xFF,0xFF,/*\二\

0x7B,0xEF,0x7B,0xCF,0x03,0xE0,0x7B,0xF7,0x7B,0x77,0xFF,0xBD,0x07,0xDE,0xFF,0xE7,

0x00,0xF8,0xFF,0xFF,0x7B,0xDF,0x7B,0xDF,0x03,0xC0,0x7B,0xDF,0x7B,0xDF,0xFF,0xFF,/*\班\

0xFB,0xFF,0xFB,0x01,0xFB,0xFD,0xFB,0xFD,0x0B,0x85,0x6B,0xB5,0x6A,0xB5,0x69,0xB5,

0x6B,0xB5,0x6B,0xB5,0x0B,0x85,0xFB,0xFD,0xFB,0x7D,0xFB,0x01,0xFB,0xFF,

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0xFF,0xFF,/*\高\

0xFF,0xFF,0xFF,0x7E,0x7F,0x7F,0x9F,0x7F,0xE7,0xBF,0xFF,0xBF,0xFF,0xDF,0x00,0xEC,

0xFF,0xF7,0xFF,0xFB,0xF7,0xFD,0x6F,0xFE,0xDF,0xFF,0x3F,0xFF,0xFF,0xFF,0xFF,0xFF,/*\少\

0xFB,0xFF,0xFB,0xFF,0x1B,0x00,0xDB,0xF6,0xDB,0xF6,0xDB,0xF6,0xDB,0xF6,0x00,0x80,

0xDB,0xF6,0xDB,0xF6,0xDA,0xB6,0xD9,0x76,0x1B,0x80,0xFB,0xFF,0xFB,0xFF,0xFF,0xFF,/*\甫\

0xBF,0xFD,0xBB,0x7D,0xAB,0x7D,0xAB,0x65,0xAA,0xA9,0xA9,0xAC,0x2B,0xDD,0x83,0xDD,

0xAB,0xDD,0xA9,0xAD,0xAA,0xB1,0xAB,0xBD,0xAB,0x7D,0xBB,0xFD,0xBF,0xFD,0xFF,0xFF,/*\姜\

0x7B,0xFF,0xAA,0xFF,0xD9,0xFF,0xA3,0x80,0xFB,0x2A,0xBF,0xAA,0x8B,0xAA,0xBA,0xAA,

0x82,0xAA,0xAA,0xAA,0xBB,0x2A,0xF0,0x80,0xCB,0xFF,0xBA,0xFF,0x1B,0xFF,0xFF,0xFF,/*\贇\

0xF7,0xFF,0xF7,0x7F,0xF7,0xBF,0xF7,0xDF,0xF7,0xE7,0x07,0xF8,0x76,0xFF,0x71,0xFF,

0x77,0xBF,0x77,0x7F,0x77,0xBF,0x77,0xC0,0xF7,0xFF,0xF7,0xFF,0xF7,0xFF,0xFF,0xFF,/*\方\

0xFF,0xBF,0xFF,0xCF,0x03,0xF0,0xFB,0x7F,0x7B,0xBF,0x7B,0xDF,0x7B,0xE7,0x7A,0xF9,

0x09,0xFE,0x7B,0xF9,0x7B,0xE7,0x7B,0xDF,0x7B,0xBF,0x7B,0x7F,0xFB,0x7F,0

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