树莓派_字母板的使用

一、实验目的

熟悉字母板

二、实验内容

用LED矩阵实现一个字母板，由RPi程序显示不同的字母和符号。PS：又采购了一批小字母板，每个人可以有一个，找 你们的TA去拿

三、主要仪器设备

1. RPI
2. 移动电源
3. Win7 PC机一台
4. 面包板
5. 面包线、杜邦线
6. 字母板

四、操作方法和实验步骤

1.安装wiringPi库
使用git工具下载wiringPi



查询当前目录下的wiringPi，并进入该目录，使用build命令安装





验证，已安装！



2.电路设计




实际上电路是按顺序接的：





电路接线



电路接线

3.实验代码
输出设计为：





程序中各写操作对应：
列的0值表示亮，1值表示暗。
行的0值表示暗，1值表示亮。
欲控制某行某列点亮，必须该行值为1和该列值为0。
以下是全暗的例子：
digitalWrite(0, 0); 行8
digitalWrite(1, 1); 列5
digitalWrite(2, 1); 列3
digitalWrite(3, 0); 行5
digitalWrite(4, 1); 列8
digitalWrite(5, 0); 行7
digitalWrite(6, 1); 列2
digitalWrite(7, 1); 列1
digitalWrite(8, 0); 行6
digitalWrite(9, 0); 行3
digitalWrite(10, 1); 列4
digitalWrite(11, 0); 行1
digitalWrite(12, 1); 列6
digitalWrite(13, 1); C7
digitalWrite(14, 0); 行2
digitalWrite(15, 0); 行4

#include <stdio.h> #include <wiringPi.h> #include <stdlib.h> int main(int argc,char * argv[]){ struct timeval t_start,t_end; int pin, flag, i; long percent, time, cost_time; wiringPiSetup ();//³õʼ»¯Ð´¿Ú for (pin = 0 ; pin < 16; ++pin) { pinMode (pin, OUTPUT) ; } while(1)//Ñ­»·Êä³ö { i=0; while(i < 250) //Ñ­»·Êä³öM { if(i % 5 == 0) //Êä³öµÚÒ»ÁÐ { digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 1); digitalWrite(3, 1); digitalWrite(4, 1); digitalWrite(5, 1); digitalWrite(6, 0); digitalWrite(7, 1); digitalWrite(8, 1); digitalWrite(9, 1); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 1); } if(i % 5 == 1) //Êä³öµÚ¶þÁÐ { digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 0); digitalWrite(3, 0); digitalWrite(4, 1); digitalWrite(5, 0); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 0); digitalWrite(9, 0); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 0); } if(i % 5 == 2) { digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 1); digitalWrite(3, 1); digitalWrite(4, 1); digitalWrite(5, 1); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 1); digitalWrite(9, 1); digitalWrite(10, 0); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 1); } if(i % 5 == 3) { digitalWrite(0, 0); digitalWrite(1, 0); digitalWrite(2, 1); digitalWrite(3, 0); digitalWrite(4, 1); digitalWrite(5, 0); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 0); digitalWrite(9, 0); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 0); } if(i % 5 == 4) { digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 1); digitalWrite(3, 1); digitalWrite(4, 1); digitalWrite(5, 1); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 1); digitalWrite(9, 1); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 0); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 1); } i++; delay(3); } //È«°µ£¬Çø·ÖÁ½¸ö×Öĸ digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 1); digitalWrite(3, 0); digitalWrite(4, 1); digitalWrite(5, 0); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 0); digitalWrite(9, 0); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 0); digitalWrite(15, 0); delay(100); i = 0; while(i < 250){ if(i % 5 == 0) //Êä³öµÚÒ»ÁÐ { digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 1); digitalWrite(3, 0); digitalWrite(4, 1); digitalWrite(5, 1); digitalWrite(6, 0); digitalWrite(7, 1); digitalWrite(8, 1); digitalWrite(9, 0); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 0); } if(i % 5 == 1) //Êä³öµÚ¶þÁÐ { digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 0); digitalWrite(3, 0); digitalWrite(4, 1); digitalWrite(5, 1); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 0); digitalWrite(9, 0); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 0); } if(i % 5 == 2) { digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 1); digitalWrite(3, 1); digitalWrite(4, 1); digitalWrite(5, 1); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 1); digitalWrite(9, 1); digitalWrite(10, 0); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 1); } if(i % 5 == 3) { digitalWrite(0, 0); digitalWrite(1, 0); digitalWrite(2, 1); digitalWrite(3, 0); digitalWrite(4, 1); digitalWrite(5, 0); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 0); digitalWrite(9, 0); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 1); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 0); } if(i % 5 == 4) { digitalWrite(0, 0); digitalWrite(1, 1); digitalWrite(2, 1); digitalWrite(3, 0); digitalWrite(4, 1); digitalWrite(5, 0); digitalWrite(6, 1); digitalWrite(7, 1); digitalWrite(8, 0); digitalWrite(9, 0); digitalWrite(10, 1); digitalWrite(11, 0); digitalWrite(12, 0); digitalWrite(13, 1); digitalWrite(14, 1); digitalWrite(15, 0); } i++; delay(3); } } return 0; }

4.实验结果
复制代码至树莓派，ls查看



编译代码



运行后效果如下



实际上屏幕一直在M和J来回跳动，MJ即满绩。。。。

具体效果请看下面一段视频:
http://v.youku.com/v_show/id_XNTc0MzYyOTE2.html