LED matrix not working...

[CrazyPharaoh]

Hi, i have the 8x8 1.2" LED matrix. its a great piece of kit but i have one issue, when i light up all the LEDs, the matrix flickers and is dimmed, as if it doesnt have enough power. But if i light 54 of the 64 LEDs, the same thing happens for about 5 seconds then it lights up normally with normal brightness.

I have no idea why its not working, here is the code just incase...(and yes, its an adaptation of the example)

Code: Select all

#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

Adafruit_8x8matrix matrix = Adafruit_8x8matrix();

void setup() {
  Serial.begin(9600);
  Serial.println("8x8 LED Matrix Test");
  
  matrix.begin(0x70);  // pass in the address
}

static const uint8_t PROGMEM
  full_bmp[] =
  { B11111111,
    B11111111,
    B11100011,
    B11100011,
    B11111110,
    B11111111,
    B11111111,
    B11111000},
  neutral_bmp[] =
  { B00111100,
    B01000010,
    B10100101,
    B10000001,
    B10111101,
    B10000001,
    B01000010,
    B00111100 },
  frown_bmp[] =
  { B00111100,
    B01000010,
    B10100101,
    B10000001,
    B10011001,
    B10100101,
    B01000010,
    B00111100 };
 
 

void loop() {
  matrix.clear();
  matrix.drawBitmap(0, 0, full_bmp, 8, 8, LED_ON);
  matrix.writeDisplay();
  } 

[CrazyPharaoh]

I have a quick update... if i connect the DAT pin to the CLK pin, the matrix works properly! But, i still need to know if that's dangerous or not good for the backpack in any way (and it would be great to get it to work normally).

So if someone could fill me in, that would be great! Thanks in advance!