Projeto 10: Controlo de Matriz Led 8x8 + controlador com o Arduino.

Neste projeto vou mostrar como utilizar, a Matriz Led 8x8 e o respetivo controlador, com o Arduino.

O esquema:

As ligações são muito simples:

VCC - 5V
GND - GND
DIN - Pin 4
CLK - Pin5
CS - Pin 5


O código:

// Programa : Scrool horizontal com matriz de leds 8x8
 // Baseado no livro Arduino Basico, de Michael McRoberts
 
 #include <pgmspace.h>
 #include <TimerOne.h>
 
 int DataPin = 4;  //Ligar o pino 4 do Arduino ao DIN do modulo
 int ClockPin = 5; //Ligar o pino 5 do Arduino ao CLK do módulo
 int LoadPin = 6;  //Ligar o pino 6 do Arduinio ao pino CS/Load do módulo
 
 byte buffer[8];
 
 static byte font[][8] PROGMEM = {
 
 {B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000},   
 {B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000000, B00000100},   
 {B00001010, B00001010, B00001010, B00000000, B00000000, B00000000, B00000000, B00000000},   
 {B00000000, B00001010, B00011111, B00001010, B00011111, B00001010, B00011111, B00001010},   
 {B00000111, B00001100, B00010100, B00001100, B00000110, B00000101, B00000110, B00011100},   
 {B00011001, B00011010, B00000010, B00000100, B00000100, B00001000, B00001011, B00010011},   
 {B00000110, B00001010, B00010010, B00010100, B00001001, B00010110, B00010110, B00001001},   
 {B00000100, B00000100, B00000100, B00000000, B00000000, B00000000, B00000000, B00000000},   
 {B00000010, B00000100, B00001000, B00001000, B00001000, B00001000, B00000100, B00000010},   
 {B00001000, B00000100, B00000010, B00000010, B00000010, B00000010, B00000100, B00001000},   
 {B00010101, B00001110, B00011111, B00001110, B00010101, B00000000, B00000000, B00000000},   
 {B00000000, B00000000, B00000100, B00000100, B00011111, B00000100, B00000100, B00000000},   
 {B00000000, B00000000, B00000000, B00000000, B00000000, B00000110, B00000100, B00001000},   
 {B00000000, B00000000, B00000000, B00000000, B00001110, B00000000, B00000000, B00000000},   
 {B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000100},   
 {B00000001, B00000010, B00000010, B00000100, B00000100, B00001000, B00001000, B00010000},   
 {B00001110, B00010001, B00010011, B00010001, B00010101, B00010001, B00011001, B00001110},   
 {B00000100, B00001100, B00010100, B00000100, B00000100, B00000100, B00000100, B00011111},   
 {B00001110, B00010001, B00010001, B00000010, B00000100, B00001000, B00010000, B00011111},   
 {B00001110, B00010001, B00000001, B00001110, B00000001, B00000001, B00010001, B00001110},   
 {B00010000, B00010000, B00010100, B00010100, B00011111, B00000100, B00000100, B00000100},   
 {B00011111, B00010000, B00010000, B00011110, B00000001, B00000001, B00000001, B00011110},   
 {B00000111, B00001000, B00010000, B00011110, B00010001, B00010001, B00010001, B00001110},   
 {B00011111, B00000001, B00000001, B00000001, B00000010, B00000100, B00001000, B00010000},   
 {B00001110, B00010001, B00010001, B00001110, B00010001, B00010001, B00010001, B00001110},   
 {B00001110, B00010001, B00010001, B00001111, B00000001, B00000001, B00000001, B00000001},   
 {B00000000, B00000100, B00000100, B00000000, B00000000, B00000100, B00000100, B00000000},   
 {B00000000, B00000100, B00000100, B00000000, B00000000, B00000100, B00000100, B00001000},   
 {B00000001, B00000010, B00000100, B00001000, B00001000, B00000100, B00000010, B00000001},   
 {B00000000, B00000000, B00000000, B00011110, B00000000, B00011110, B00000000, B00000000},   
 {B00010000, B00001000, B00000100, B00000010, B00000010, B00000100, B00001000, B00010000},   
 {B00001110, B00010001, B00010001, B00000010, B00000100, B00000100, B00000000, B00000100},   
 {B00001110, B00010001, B00010001, B00010101, B00010101, B00010001, B00010001, B00011110},   
 {B00001110, B00010001, B00010001, B00010001, B00011111, B00010001, B00010001, B00010001},   
 {B00011110, B00010001, B00010001, B00011110, B00010001, B00010001, B00010001, B00011110},   
 {B00000111, B00001000, B00010000, B00010000, B00010000, B00010000, B00001000, B00000111},   
 {B00011100, B00010010, B00010001, B00010001, B00010001, B00010001, B00010010, B00011100},  
 {B00011111, B00010000, B00010000, B00011110, B00010000, B00010000, B00010000, B00011111},   
 {B00011111, B00010000, B00010000, B00011110, B00010000, B00010000, B00010000, B00010000},   
 {B00001110, B00010001, B00010000, B00010000, B00010111, B00010001, B00010001, B00001110},   
 {B00010001, B00010001, B00010001, B00011111, B00010001, B00010001, B00010001, B00010001},   
 {B00011111, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00011111},   
 {B00011111, B00000100, B00000100, B00000100, B00000100, B00000100, B00010100, B00001000},   
 {B00010001, B00010010, B00010100, B00011000, B00010100, B00010010, B00010001, B00010001},   
 {B00010000, B00010000, B00010000, B00010000, B00010000, B00010000, B00010000, B00011111},   
 {B00010001, B00011011, B00011111, B00010101, B00010001, B00010001, B00010001, B00010001},   
 {B00010001, B00011001, B00011001, B00010101, B00010101, B00010011, B00010011, B00010001},   
 {B00001110, B00010001, B00010001, B00010001, B00010001, B00010001, B00010001, B00001110},   
 {B00011110, B00010001, B00010001, B00011110, B00010000, B00010000, B00010000, B00010000},   
 {B00001110, B00010001, B00010001, B00010001, B00010001, B00010101, B00010011, B00001111},   
 {B00011110, B00010001, B00010001, B00011110, B00010100, B00010010, B00010001, B00010001},   
 {B00001110, B00010001, B00010000, B00001000, B00000110, B00000001, B00010001, B00001110},   
 {B00011111, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100},   
 {B00010001, B00010001, B00010001, B00010001, B00010001, B00010001, B00010001, B00001110},   
 {B00010001, B00010001, B00010001, B00010001, B00010001, B00010001, B00001010, B00000100},   
 {B00010001, B00010001, B00010001, B00010001, B00010001, B00010101, B00010101, B00001010},   
 {B00010001, B00010001, B00001010, B00000100, B00000100, B00001010, B00010001, B00010001},   
 {B00010001, B00010001, B00001010, B00000100, B00000100, B00000100, B00000100, B00000100},   
 {B00011111, B00000001, B00000010, B00000100, B00001000, B00010000, B00010000, B00011111},   
 {B00001110, B00001000, B00001000, B00001000, B00001000, B00001000, B00001000, B00001110},   
 {B00010000, B00001000, B00001000, B00000100, B00000100, B00000010, B00000010, B00000001},   
 {B00001110, B00000010, B00000010, B00000010, B00000010, B00000010, B00000010, B00001110},   
 {B00000100, B00001010, B00010001, B00000000, B00000000, B00000000, B00000000, B00000000},   
 {B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00011111},   
 {B00001000, B00000100, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000},   
 {B00000000, B00000000, B00000000, B00001110, B00010010, B00010010, B00010010, B00001111},   
 {B00000000, B00010000, B00010000, B00010000, B00011100, B00010010, B00010010, B00011100},   
 {B00000000, B00000000, B00000000, B00001110, B00010000, B00010000, B00010000, B00001110},   
 {B00000000, B00000001, B00000001, B00000001, B00000111, B00001001, B00001001, B00000111},   
 {B00000000, B00000000, B00000000, B00011100, B00010010, B00011110, B00010000, B00001110},   
 {B00000000, B00000011, B00000100, B00000100, B00000110, B00000100, B00000100, B00000100},   
 {B00000000, B00001110, B00001010, B00001010, B00001110, B00000010, B00000010, B00001100},   
 {B00000000, B00010000, B00010000, B00010000, B00011100, B00010010, B00010010, B00010010},   
 {B00000000, B00000000, B00000100, B00000000, B00000100, B00000100, B00000100, B00000100},   
 {B00000000, B00000010, B00000000, B00000010, B00000010, B00000010, B00000010, B00001100},   
 {B00000000, B00010000, B00010000, B00010100, B00011000, B00011000, B00010100, B00010000},   
 {B00000000, B00010000, B00010000, B00010000, B00010000, B00010000, B00010000, B00001100},   
 {B00000000, B00000000, B00000000, B00001010, B00010101, B00010001, B00010001, B00010001},   
 {B00000000, B00000000, B00000000, B00010100, B00011010, B00010010, B00010010, B00010010},   
 {B00000000, B00000000, B00000000, B00001100, B00010010, B00010010, B00010010, B00001100},   
 {B00000000, B00011100, B00010010, B00010010, B00011100, B00010000, B00010000, B00010000},   
 {B00000000, B00001110, B00010010, B00010010, B00001110, B00000010, B00000010, B00000001},   
 {B00000000, B00000000, B00000000, B00001010, B00001100, B00001000, B00001000, B00001000},   
 {B00000000, B00000000, B00001110, B00010000, B00001000, B00000100, B00000010, B00011110},   
 {B00000000, B00010000, B00010000, B00011100, B00010000, B00010000, B00010000, B00001100},   
 {B00000000, B00000000, B00000000, B00010010, B00010010, B00010010, B00010010, B00001100},   
 {B00000000, B00000000, B00000000, B00010001, B00010001, B00010001, B00001010, B00000100},   
 {B00000000, B00000000, B00000000, B00010001, B00010001, B00010001, B00010101, B00001010},   
 {B00000000, B00000000, B00000000, B00010001, B00001010, B00000100, B00001010, B00010001},   
 {B00000000, B00000000, B00010001, B00001010, B00000100, B00001000, B00001000, B00010000},   
 {B00000000, B00000000, B00000000, B00011111, B00000010, B00000100, B00001000, B00011111},   
 {B00000010, B00000100, B00000100, B00000100, B00001000, B00000100, B00000100, B00000010},   
 {B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100},   
 {B00001000, B00000100, B00000100, B00000100, B00000010, B00000100, B00000100, B00001000},   
 {B00000000, B00000000, B00000000, B00001010, B00011110, B00010100, B00000000, B00000000}   
 };  
 
 void clearDisplay() {
     for (byte x=0; x<8; x++) {
         buffer[x] = B00000000;
     }
     screenUpdate();
 }
 
 void initMAX7219() {
     pinMode(DataPin, OUTPUT);
     pinMode(LoadPin, OUTPUT);
     pinMode(ClockPin, OUTPUT);
     clearDisplay();
     writeData(B00001011, B00000111);
     writeData(B00001001, B00000000);
     writeData(B00001100, B00000001);
     intensity(1);
 }
 
 void intensity(int intensity) {
     writeData(B00001010, intensity);
     }
 
 void writeData(byte MSB, byte LSB) {
     byte mask;
     digitalWrite(LoadPin, LOW);
     
     for (mask = B10000000; mask>0; mask >>= 1) {
         digitalWrite(ClockPin, LOW);
         if (MSB & mask){
             digitalWrite(DataPin,HIGH);
         }
         else{
             digitalWrite(DataPin,LOW);
         }
         digitalWrite(ClockPin, HIGH);
     }
     
      for (mask = B10000000; mask>0; mask >>= 1) {
         digitalWrite(ClockPin, LOW);
         if (LSB & mask){
             digitalWrite(DataPin,HIGH);
         }
         else{
             digitalWrite(DataPin,LOW);
         }
         digitalWrite(ClockPin, HIGH);
     }
     digitalWrite(LoadPin, HIGH);
     digitalWrite(ClockPin, LOW);
 }
 
 
 void scroll(char myString[], int speed) {
     byte firstChrRow, secondChrRow;
     byte ledOutput;
     byte chrPointer = 0;
     byte Char1, Char2;
     byte scrollBit = 0;
     byte strLength = 0;
     unsigned long time;
     unsigned long counter;
 
     
     while (myString[strLength]) {strLength++;}
 
     counter = millis();
      while (chrPointer < (strLength-1)) {
         time = millis();
         if (time > (counter + speed)) {
             Char1 = myString[chrPointer];
             Char2 = myString[chrPointer+1];
             for (byte y= 0; y<8; y++) {
                 firstChrRow = pgm_read_byte(&font[Char1 - 32][y]);
                 secondChrRow = (pgm_read_byte(&font[Char2 - 32][y])) << 1;
                 ledOutput = (firstChrRow << scrollBit) | (secondChrRow >>
  (8 - scrollBit) );
                 buffer[y] = ledOutput;
             }
             scrollBit++;
             if (scrollBit > 6) {
             scrollBit = 0;
             chrPointer++;
             }
             counter = millis();
         }
     }
 }
 
 void screenUpdate() {
     for (byte row = 0; row < 8; row++) {
         writeData(row+1, buffer[row]);
     }
 }
 
 void setup() {
     initMAX7219();
     Timer1.initialize(10000);    
     Timer1.attachInterrupt(screenUpdate);
 }
 
 void loop() {
     clearDisplay();  
     scroll(" Jacinto, Joao e Cristina ", 100); //Exibe a mensagem, com intervalo de scroll de 100
     scroll(" 15 - 03 - 2014 ", 100);        //Adicione mais linhas para mostrar outros caracteres
 }


Referências:
- pgmspace.h já vem instalada com o Arduino
- TimerOne.h download em http://www.pjrc.com/teensy/arduino_libraries/TimerOne.zip


O vídeo:

Espero que gostem!