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Author Topic: Stuck... any sugesstions?  (Read 276 times)
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Ok so I've been able to draw a predefined sprite on an LED matrix with 2 595s, but I seem to be stuck as how to update the display dynamically. Any ideas on how to update the display via serial?

Code:
byte dataPin = 0; // 74HC595 pin 14
byte latchPin = 1; // 74HC595 pin 12
byte clockPin = 2; // 74HC595 pin 11

byte data; // storage for the current data byte
byte dataArray[8]; // define the data array

byte row; // storrage for the current row byte
byte rowArray[8]; // define the row array

void setup()
{
  pinMode(dataPin, OUTPUT); //pinmode setup
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);

// column registers for image data.
  dataArray[0] = B00011000;
  dataArray[1] = B00111100;
  dataArray[2] = B01111110;
  dataArray[3] = B11011011;
  dataArray[4] = B11111111;
  dataArray[5] = B01011010;
  dataArray[6] = B10000001;
  dataArray[7] = B01000010;

// row registers... DO NOT CHANGE THESE!
  rowArray[0] = B01111111;
  rowArray[1] = B10111111;
  rowArray[2] = B11011111;
  rowArray[3] = B11101111;
  rowArray[4] = B11110111;
  rowArray[5] = B11111011;
  rowArray[6] = B11111101;
  rowArray[7] = B11111110;
}

void loop()
{
  drawSprite();
}

void drawSprite()
{
  for(int j = 0; j < 8; j++){ // load the byte...
    data = dataArray[j]; // from the data array...
    row = rowArray[j]; // and the row array
    digitalWrite(latchPin, LOW); // ground the latch pin
    shiftOut(dataPin, clockPin, MSBFIRST, data); // shift out the data
    shiftOut(dataPin, clockPin, MSBFIRST, row); // shift out the row byte
    digitalWrite(latchPin, HIGH); // it's finished so bring the latch pin high
    //delay(50); // left in to display the plex at low speed    
  }
}
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there are 10 types of people in this world, those who can read binary and those who can't.

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