第二十九课--Microduino 8*8点阵纵向移动显示/zh

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Pkj讨论 | 贡献2014年3月18日 (二) 02:41的版本 调试
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目的

本教程将在上一静态显示教程基础上纵向移动笑脸动态显示。

设备

8*8点阵LED的型号是:LD-1088BS,其引脚定义如下图:

第二十九课-8 8点阵引脚定义.jpg

原理图

第二十九课-Microduino8 8点阵横向移动原理图.jpg


引脚表:

点阵ROW 点阵16pin 74HC595 74HC595
1 13 15 Q0
2 3 1 Q1
3 4 2 Q2
4 10 3 Q3
5 6 4 Q4
6 11 5 Q5
7 15 6 Q6
8 16 7 Q7
点阵COL 点阵16pin 74HC595 74HC595
1 5 15 Q0
2 2 1 Q1
3 7 2 Q2
4 1 3 Q3
5 12 4 Q4
6 8 5 Q5
7 14 6 Q6
8 9 7 Q7


程序

//Pin 连接到 74HC595的ST_CP
int latchPin = 8;
//Pin 连接到 74HC595的SH_CP
int clockPin = 12;
//Pin 连接到 74HC595的DS
int dataPin = 11;

//设定时间
unsigned long time;

//掩盖行定义
byte masks[8]={
  B01111111,B10111111,B11011111,B11101111,B11110111,B11111011,B11111101,B11111110};

  //笑脸纵向移动定义
byte rows[4][8]={
  {
    B00111100,B01000010,B10100101,B10000001,B10100101,B10011001,B01000010,B00111100  }
  ,
  {
    B00111100,B00111100,B01000010,B10100101,B10000001,B10100101,B10011001,B01000010  }
  ,
  {
    B01000010,B00111100,B00111100,B01000010,B10100101,B10000001,B10100101,B10011001  }
  ,
   {
    B10011001,B01000010,B00111100,B00111100,B01000010,B10100101,B10000001,B10100101  }
};


void setup() {
  //波特率为9600,用于调试         
  Serial.begin(9600);
  //设置 latchpin 为 output
  pinMode(latchPin, OUTPUT);

}

void loop() {

  //笑脸纵向移动
  for(int j=0;j<4;j++) {

    unsigned long startTime = millis();
    for (unsigned long elapsed=0; elapsed < 1000; elapsed = millis() - startTime) {//持续显示600ms
      for(int i=0;i<8;i++) {
        digitalWrite(latchPin, 0);
        shiftOut(dataPin, clockPin, masks[i]);  //mask(col)
        shiftOut(dataPin, clockPin, rows[j][i]);  //row
        digitalWrite(latchPin, 1);
      }
    }
    //time=0;

  }
}

void shiftOut(int myDataPin, int myClockPin, byte myDataOut) {
  // This shifts 8 bits out MSB first,
  //on the rising edge of the clock,
  //clock idles low

  //internal function setup
  int i=0;
  int pinState;
  pinMode(myClockPin, OUTPUT);
  pinMode(myDataPin, OUTPUT);

  //clear everything out just in case to
  //prepare shift register for bit shifting
  digitalWrite(myDataPin, 0);
  digitalWrite(myClockPin, 0);

  //for each bit in the byte myDataOut&#239;&#191;&#189;
  //NOTICE THAT WE ARE COUNTING DOWN in our for loop
  //This means that %00000001 or "1" will go through such
  //that it will be pin Q0 that lights.
  for (i=7; i>=0; i--)  {
    digitalWrite(myClockPin, 0);

    //if the value passed to myDataOut and a bitmask result
    // true then... so if we are at i=6 and our value is
    // %11010100 it would the code compares it to %01000000
    // and proceeds to set pinState to 1.
    if ( myDataOut & (1<<i) ) {
      pinState= 1;
    }
    else {       
      pinState= 0;
    }

    //Sets the pin to HIGH or LOW depending on pinState
    digitalWrite(myDataPin, pinState);
    //register shifts bits on upstroke of clock pin  
    digitalWrite(myClockPin, 1);
    //zero the data pin after shift to prevent bleed through
    digitalWrite(myDataPin, 0);
  }

  //stop shifting
  digitalWrite(myClockPin, 0);
}

在程序中定义byte rows[4][8]的四个纵向移动动作

调试

步骤一:把代码复制到IDE中,编译

步骤二:电路连接如下图:

第二十九课-Microduino8 8点阵纵向移动连接图.jpg

为了更好的保护电路,可以在其中一个74HC595芯片连接8*8点阵之间的八条线中各加一个220欧姆电阻,本例中没有加入电阻所以LED特别亮,如果点阵的质量不好的话很容易坏掉。

步骤三:运行代码

结果

8*8点阵LED上面的笑脸会纵向移动显示

视频

http://v.youku.com/v_show/id_XNjg2MDUwOTQ4.html