19 September, 2015

Arduino: LED Matrix state as array of bytes

Recently I released and have written about Arduino: LED Matrix Editor

This is online editor for LED dot matrices, that helps people to make animations and save them as C-code for Arduino. In that version was only option to save matrices as unsigned 64-bit integers (uint64_t). I prefer this form as the most compact representation of the 8x8 matrix.

However some people experiencing problems with uint64_t data type (due to limitation in their software or hardware). In order to support this case (and make them happy) I just added a new option to save images as arrays of bytes in binary form:

LED Matrix as byte array

Generated arrays take much more lines of code. But, nevertheless, they are more evident.

Here is a sample how to animate matrix using this code:

#include <LedControl.h>

const int DIN_PIN = 7;
const int CS_PIN = 6;
const int CLK_PIN = 5;

const byte IMAGES[][8] = {
  {
    B00010000,
    B00110000,
    B00010000,
    B00010000,
    B00010000,
    B00010000,
    B00010000,
    B00111000
  }, {
    B00111000,
    B01000100,
    B00000100,
    B00000100,
    B00001000,
    B00010000,
    B00100000,
    B01111100
  }, {
    B00111000,
    B01000100,
    B00000100,
    B00011000,
    B00000100,
    B00000100,
    B01000100,
    B00111000
  }, {
    B00000100,
    B00001100,
    B00010100,
    B00100100,
    B01000100,
    B01111100,
    B00000100,
    B00000100
  }, {
    B01111100,
    B01000000,
    B01000000,
    B01111000,
    B00000100,
    B00000100,
    B01000100,
    B00111000
  }, {
    B00111000,
    B01000100,
    B01000000,
    B01111000,
    B01000100,
    B01000100,
    B01000100,
    B00111000
  }, {
    B01111100,
    B00000100,
    B00000100,
    B00001000,
    B00010000,
    B00100000,
    B00100000,
    B00100000
  }, {
    B00111000,
    B01000100,
    B01000100,
    B00111000,
    B01000100,
    B01000100,
    B01000100,
    B00111000
  }, {
    B00111000,
    B01000100,
    B01000100,
    B01000100,
    B00111100,
    B00000100,
    B01000100,
    B00111000
  }, {
    B00111000,
    B01000100,
    B01000100,
    B01000100,
    B01000100,
    B01000100,
    B01000100,
    B00111000
  }
};

const int IMAGES_LEN = sizeof(IMAGES) / 8;

LedControl display = LedControl(DIN_PIN, CLK_PIN, CS_PIN);

void setup() {
  display.clearDisplay(0);
  display.shutdown(0, false);
  display.setIntensity(0, 5);
}

void displayImage(const byte* image) {
  for (int i = 0; i < 8; i++) {
    for (int j = 0; j < 8; j++) {
      display.setLed(0, i, j, bitRead(image[i], 7 - j));
    }
  }
}

int i = 0;

void loop() {
  displayImage(IMAGES[i]);
  if (++i >= IMAGES_LEN ) {
    i = 0;
  }
  delay(333);
}

Animation video:

5 comments:

Jean Lussac said...

Hello,
thanks for this modications. God job !
Thanks !
Best regards

Alex Bell said...

You are welcome!

Karim Chouti said...

Comment télécharger logiciel svp

Matti Virta said...

aargh, alltime error, },{ row ewery line.
i try do many but no help, what need do.

Alex Bell said...

>> aargh, alltime error
What the problem?