图9
IC各脚定义见图10。
图10
5．电原理图见图11。
图11
三. 软件设计 1． 摇棒的启动
通过P3.6和P3.7输出驱动音圈电机的信号, 由于没有设置检测摇棒的传感器，时间间隔只能跟据实验确定。在调试中发现，当驱动摇棒的信号转换加速到一定的时候，从静止状态转到正常摆动状态发生困难，因此需要由慢到快的驱动过程。由下面的程序段实现。 do { mm--;
DelayMs(120+mm*5); //逐渐缩短延时间 put1=~put1; put2=~put2; //转换输出口电平状态 }while(mm>0); 2． 秒闪现的实现
数字和字符的闪现是通过变量Ms和数组w[]实现的，如需要七位字符中的间的第4位闪现，则w[3]=1。这是通过全局变量Ms在void timer0(void)函数中每隔一秒改变一次状态（0或1），在void timer1(void)函数中的下列语句中实现。
if((put1==1)&&(ii<7)&&(Ms*w[ii]==0)) P2=~ASCIIDOC[v[ii]*6+jj]; else P2=0xff; 3． 校正显示不均匀
调试中发现，显示屏上的字符并不是一样宽的，仔细分析是由于摇棒在运动中一直受力，使摇棒产生加速运动，这样就需要在程序中加一校正因子，逐渐缩短显示的时间段。具体是通过变量tt在函数void timer1(void)中实现的。 4． 按键去抖程序
按键的去抖采用软件编程实现，其方法是当检测到按键的接口出现低电平后，隔一段时间再检测，如还是低电平，则确认为有效，否则无效。具体的程序是通过函数unsigned char ChKey(bit Key)实现。 5． 显示同步
调试时要根据实际情况确定Ti的值，保证显示正常。 6．预留的部分功能
提供的程序除提供了一个完整的时钟程序外，还预留了显示七个字符功能（见图12），
只是主程序要作一些修改。
图12
7．完整C51程序代码
/*
POV摇摆显示LED钟C51程序
周正华编 2008.2.29 */
#include
/*硬件端口定义*/ sbit set0=P0^1; sbit set1=P0^0; sbit set2=P0^2;
sbit put1=P3^6; sbit put2=P3^7;
/*时钟用数组*/
unsigned char BUFFER[]={0,0,0,0}; unsigned char maxnum[]={59,23};
/*显示用数组*/ unsigned int v[20]; unsigned int w[7];
/*字符字模*/
unsigned char code ASCIIDOC[] = // ASCII {
0x7C,0x8A,0x92,0xA2,0x7C,0x00, // -0-00 0x00,0x42,0xFE,0x02,0x00,0x00, // -1-01 0x46,0x8A,0x92,0x92,0x62,0x00, // -2-02 0x84,0x82,0x92,0xB2,0xCC,0x00, // -3-03 0x18,0x28,0x48,0xFE,0x08,0x00, // -4-04 0xE4,0xA2,0xA2,0xA2,0x9C,0x00, // -5-05 0x3C,0x52,0x92,0x92,0x8C,0x00, // -6-06 0x80,0x8E,0x90,0xA0,0xC0,0x00, // -7-07 0x6C,0x92,0x92,0x92,0x6C,0x00, // -8-08 0x62,0x92,0x92,0x94,0x78,0x00, // -9-09 0x00,0x00,0x00,0x00,0x00,0x00, // - -10 0x00,0x00,0xFA,0x00,0x00,0x00, // -!-11 0x04,0x08,0x10,0x20,0x40,0x00, // -/-12 0x00,0x6C,0x6C,0x00,0x00,0x00, // -:-13 0x3E,0x48,0x88,0x48,0x3E,0x00, // -A-14 0xFE,0x92,0x92,0x92,0x6C,0x00, // -B-15 0x7C,0x82,0x82,0x82,0x44,0x00, // -C-16 0xFE,0x82,0x82,0x82,0x7C,0x00, // -D-17 0xFE,0x92,0x92,0x92,0x82,0x00, // -E-18 0xFE,0x90,0x90,0x90,0x80,0x00, // -F-19 0x7C,0x82,0x8A,0x8A,0x4E,0x00, // -G-20 0xFE,0x10,0x10,0x10,0xFE,0x00, // -H-21
0x00,0x82,0xFE,0x82,0x00,0x00, // -I-22 0x04,0x02,0x82,0xFC,0x80,0x00, // -J-23 0xFE,0x10,0x28,0x44,0x82,0x00, // -K-24 0xFE,0x02,0x02,0x02,0x02,0x00, // -L-25 0xFE,0x40,0x30,0x40,0xFE,0x00, // -M-26 0xFE,0x20,0x10,0x08,0xFE,0x00, // -N-27 0x7C,0x82,0x82,0x82,0x7C,0x00, // -O-28 0xFE,0x90,0x90,0x90,0x60,0x00, // -P-29 0x7C,0x82,0x8A,0x84,0x7A,0x00, // -Q-30 0xFE,0x90,0x98,0x94,0x62,0x00, // -R-31 0x64,0x92,0x92,0x92,0x4C,0x00, // -S-32 0x80,0x80,0xFE,0x80,0x80,0x00, // -T-33 0xFC,0x02,0x02,0x02,0xFC,0x00, // -U-34 0xF8,0x04,0x02,0x04,0xF8,0x00, // -V-35 0xFE,0x04,0x18,0x04,0xFE,0x00, // -W-36 0xC6,0x28,0x10,0x28,0xC6,0x00, // -X-37 0xC0,0x20,0x1E,0x20,0xC0,0x00, // -Y-38 0x86,0x8A,0x92,0xA2,0xC2,0x00, // -Z-39 0x24,0x2A,0x2A,0x1C,0x02,0x00, // -a-40 0xFE,0x14,0x22,0x22,0x1C,0x00, // -b-41 0x1C,0x22,0x22,0x22,0x10,0x00, // -c-42 0x1C,0x22,0x22,0x14,0xFE,0x00, // -d-43 0x1C,0x2A,0x2A,0x2A,0x10,0x00, // -e-44 0x10,0x7E,0x90,0x90,0x40,0x00, // -f-45 0x19,0x25,0x25,0x25,0x1E,0x00, // -g-46 0xFE,0x10,0x20,0x20,0x1E,0x00, // -h-47 0x00,0x00,0x9E,0x00,0x00,0x00, // -i-48 0x00,0x01,0x11,0x9E,0x00,0x00, // -j-49 0xFE,0x08,0x14,0x22,0x02,0x00, // -k-50 0x00,0x82,0xFE,0x02,0x00,0x00, // -l-51 0x1E,0x20,0x1E,0x20,0x1E,0x00, // -m-52 0x20,0x1E,0x20,0x20,0x1E,0x00, // -n-53 0x1C,0x22,0x22,0x22,0x1C,0x00, // -o-54 0x3F,0x24,0x24,0x24,0x18,0x00, // -p-55 0x18,0x24,0x24,0x24,0x3F,0x00, // -q-56 0x20,0x1E,0x20,0x20,0x10,0x00, // -r-57 0x12,0x2A,0x2A,0x2A,0x24,0x00, // -s-58 0x20,0xFC,0x22,0x22,0x24,0x00, // -t-59 0x3C,0x02,0x02,0x3C,0x02,0x00, // -u-60 0x38,0x04,0x02,0x04,0x38,0x00, // -v-61 0x3C,0x02,0x3C,0x02,0x3C,0x00, // -w-62 0x22,0x14,0x08,0x14,0x22,0x00, // -x-63 0x39,0x05,0x05,0x09,0x3E,0x00, // -y-64 0x22,0x26,0x2A,0x32,0x22,0x00, // -z-65