第二十八课--Microduino 8*8点阵横向移动显示/zh
| Language | English |
|---|
目的本教程将在上一静态显示教程基础上横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：
原理图
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};
//笑脸横向移动定义
byte rows[4][8]={
{
B00111100,B01000010,B10100101,B10000001,B10100101,B10011001,B01000010,B00111100 }
,
{
B00011110,B00100001,B11010010,B11000000,B11010100,B11001100,B00100001,B00011110 }
,
{
B00001111,B10010000,B11101001,B01100000,B01101010,B01100110,B10010000,B00001111 }
,
{
B10000111,B01001000,B11110100,B00110000,B00110101,B00110011,B01001000,B10000111 }
};
void setup() {
//波特率为9600，用于调试
Serial.begin(9600);
//设置 latchpin 为 output
pinMode(latchPin, OUTPUT);
}
void loop() {
//笑脸横向移动
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�
//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);
}
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： 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上面的笑脸会横向移动显示 视频 |
