64x64 LED Matrix not displaying preperly

Other Hardware LEDs and Multiplexing
1

Hello,

I recently purchased a DFRobot Mega 2560 and a 64x64 LED matrix, but i can't seem to get it to work correctly.

I have the LED panel connected to the pins on the Mega following the scheme on this page: 64x64_RGB_LED_Matrix_-_3mm_pitch_SKU_DFR0499-DFRobot

I also have a power supply that supplies 5 Volt @ 5 ampere connected to the LED panel.

Now, i am able to print stuff on the panel, but everything seems to be printed twice. It also flickers alot.

(GIF) Imgur

#include <DFRobot_RGBMatrix.h> // Hardware-specific library
#include <Wire.h>
#define OE    9
#define LAT   10
#define CLK   11
#define A     A0
#define B     A1
#define C     A2
#define D     A3
#define E     A4
#define WIDTH 64
#define HIGHT  64
DFRobot_RGBMatrix matrix(A, B, C, D, E, CLK, LAT, OE, false, WIDTH, HIGHT);

void setup()
{
  matrix.begin();
  matrix.setTextSize(1);     // size 1 == 8 pixels high
  matrix.print("LHEY");

}

void loop()
{  
}

If i disconnect the external power supply connected to the panel, it looks like this:

3968×2976 585 KB

I seems to be able to fill the whole panel with white with the following code:

void setup()
{
  matrix.begin();
  // fill the screen with 'black'
  matrix.setTextSize(1);     // size 1 == 8 pixels high
  matrix.fillScreen(matrix.Color333(7, 7, 7));

}

void loop()
{  
}

but this also flickeres alot.

What could be the problem? I have doublechecked all the cables, and it is right.

2

Have you got A4 connected to the 'HE' pin on the display connector ?

This wire is missing on the 'Connection Diagram' on the page you linked.

Your 5v 5 amp supply should be connected to the display only, don't connect the Arduino 5v to the display at all.

Yours,
TonyWilk

3

TonyWilk:
Have you got A4 connected to the 'HE' pin on the display connector ?

I do not, since it wasn't show in the connetion scheme. Will try to connect this one when i get home after work.

Your 5v 5 amp supply should be connected to the display only, don't connect the Arduino 5v to the display at all.

Do you mean the nothing should be connected to the 5v pin on the board from the LED panel? Because nothing is.

Thanks!

4

Just wanted to say that i connected the 'HE' into the Analog 4, and now it all seems to work :slight_smile:
Weird thing they chose to exlude this connection in the wiki.

Thanks again!

5

Llano:
Just wanted to say that i connected the 'HE' into the Analog 4, and now it all seems to work :slight_smile:
Weird thing they chose to exlude this connection in the wiki.

Thanks again!

Everything is in their wiki !!!

The connection is shown in the JPG

In addition, they write:

/ *************** Control signal pin connected to MEGA2560 ************************ / 
R1-> 24 G1-> 25 B1-> 26
R2-> 27 G2-> 28 B2-> 29
HA-> A0 HB-> A1 HC-> A2 HD-> A3 HE-> A4
OE-> 9 LAT-> 10 CLK-> 11
GND-> GND
6

ieee488:
Everything is in their wiki !!!

Well, yes it is NOW.... but the HE connection was certainly not shown a couple of hours ago.

Yours,
TonyWilk

7

TonyWilk:
Well, yes it is NOW.... but the HE connection was certainly not shown a couple of hours ago.

Yours,
TonyWilk

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