先上完工图，是一个笑脸
http://v.youku.com/v_show/id_XNDc4MjIzOTAw.html
一.硬件清单
1. Arduino Mango x1
2. Matrix LED 8x8 x1
3. 220欧姆电阻 x8
4. 74HC595 x2
5. 迷你面包板 x3
6. 面包线一堆{:soso_e136:}
关于点阵LED这里说一下，发现网上主要有两种规格16Pin和24Pin的
其接线方式和针脚的对应方式如图
二. 硬件接线
原理图
接线图
迷你面包板接线图
最终的实际测试效果如图
三. Arduino软件编程
代码参考了官方教程的ShiftOut[链接]
稍加修改，实现一个笑脸
[pre lang="arduino" line="1" file="MatrixLED"]//**************************************************************//
// Name : shiftOutCode, Dual Binary Counters //
// Author : Carlyn Maw, Tom Igoe //
// Date : 25 Oct, 2006 //
// Version : 1.0 //
// Notes : Code for using a 74HC595 Shift Register //
// : to count from 0 to 255 //
//**************************************************************//
//Leo tested with smile(Loop() changed) 2012.11.21
//Pin connected to ST_CP of 74HC595
int latchPin = 8;
//Pin connected to SH_CP of 74HC595
int clockPin = 12;
////Pin connected to DS of 74HC595
int dataPin = 11;
void setup() {
//Start Serial for debuging purposes
Serial.begin(9600);
//set pins to output because they are addressed in the main loop
pinMode(latchPin, OUTPUT);
}
void loop() {
//Smile for 8x8 Matrix LED
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, B01111111); //mask(col)
shiftOut(dataPin, clockPin, B00111100); //row
digitalWrite(latchPin, 1);
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, B10111111); //mask(col)
shiftOut(dataPin, clockPin, B01000010); //row
digitalWrite(latchPin, 1);
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, B11011111); //mask(col)
shiftOut(dataPin, clockPin, B10100101); //row
digitalWrite(latchPin, 1);
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, B11101111); //mask(col)
shiftOut(dataPin, clockPin, B10000001); //row
digitalWrite(latchPin, 1);
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, B11110111); //mask(col)
shiftOut(dataPin, clockPin, B10100101); //row
digitalWrite(latchPin, 1);
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, B11111011); //mask(col)
shiftOut(dataPin, clockPin, B10011001); //row
digitalWrite(latchPin, 1);
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, B11111101); //mask(col)
shiftOut(dataPin, clockPin, B01000010); //row
digitalWrite(latchPin, 1);
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, B11111110); //mask(col)
shiftOut(dataPin, clockPin, B00111100); //row
digitalWrite(latchPin, 1);
}
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);
}
[/code]
四.扩展阅读
Arduino官方教程ShiftOut：http://www.arduino.cc/en/Tutorial/ShiftOut
LED Matrix animator tool：http://www.bleq.nl/arduino/
BTW：我使用的硬件设计来自于此作者，但是软件还没消化好，希望有感兴趣的朋友一起研究！{:soso_e113:} |
发表于 2012-11-21 22:43:29
发表于 2012-11-21 23:52:47
楼主
发表于 2012-11-22 13:05:55
如果这个点阵用MAX7219驱动估计会更好呢，还有64级调亮度，不过成本比595高
