Arduino UNO printing on 32*32 1/4 scan rate missy results.

[Joye]

Hello Everyone,

I'm not sure if I'm posting in the right place

I have asked about my problem many times everywhere and I couldn’t have it solved yet.
For that I decided to make this topic for everyone who wants to share and challenge solving this problem.



To participate you will only need:

• One Arduino UNO.
• One LED Module or Panel (32x32 - ¼ Scan Rate)- *Dip Type is preferred.
• Download the RGB Matrix Panel library and Adafruit GFX Library then put them in Arduino>libraries folder.
• Replace RGBmatrixPanel.cpp and RGBmatrixPanel.h with RGBmatrixPanel.cpp & RGBmatrixPanel.h.*(Modified files for 1/4 scan rate panels)
• Some Jumper Wires.

Connect as follows:
CLK To 8
LAT To 10
OE To 9
A To A0
B To A1
C To A2 *(I don’t have it on my panel)
D To A3 *(I don’t have it on my panel)
R1 To 2
G1 To 3
B1 To 4
R2 To 5
G2 To 6
B2 To 7
GND To GND

*My Panel Has only A & B Where C & D are grounded and not there.

Copy this code and paste it in new Arduino Sketch:

#include <gamma.h>
#include <RGBmatrixPanel.h>
#include <avr/pgmspace.h>

#include <Adafruit_GFX.h>
#include <Adafruit_SPITFT.h>
#include <Adafruit_SPITFT_Macros.h>
#include <gfxfont.h>



#define CLK 8  // MUST be on PORTB! (Use pin 11 on Mega)
#define LAT 10
#define OE  9
#define A   A0
#define B   A1
#define C   A2
#define D   A3
RGBmatrixPanel matrix(A, B, C, CLK, LAT, OE, false, 2);


char inChar;                // Temp char storage
int num;
char tmpchr1;

uint64_t index = 0;
uint64_t index1 = 0;          
bool newPrint;
int r;
int g;
int b;

void setup() {
  pinMode(11,OUTPUT);
  pinMode(12,OUTPUT);
  Serial.begin(9600);
  digitalWrite(13, HIGH);
  matrix.begin();
  matrix.setTextSize(1);
  matrix.fillScreen(00);
  matrix.setTextColor(matrix.Color333(0,7,0));

  delay(100);
  matrix.print(00);
  digitalWrite(11, HIGH);
  digitalWrite(12, HIGH);
}


void loop() {
 
  // Check the availability of new input
    while(Serial.available())
    {

Loop1:
      num = Serial.parseInt();
      num = constrain(num, 0, 9999);
      Serial.print(num);

    if (num < 3)
        {
          goto Loop1;
          }

    if (num < 10)
    {
     if (num < 9)
        {
          r = 0;
          g = 7;
          b = 0;

          digitalWrite(11, HIGH);
          }     
     else
        {
          r = 7;
          g = 7;
          b = 0;
          digitalWrite(12, LOW);

          }
    }
     
     if (num > 10)
        { 
          r = 7;
          g = 0;
          b = 0;
          digitalWrite(11, LOW);

          }
          
        matrix.fillScreen(matrix.Color333(0, 0, 0));    // Delete the whole panel
        matrix.setCursor(0,0);                          // Set the top left position of the first line
        matrix.setTextColor(matrix.Color333(r,g,b));
        matrix.print(num);
        if (num < 3)
        {
          matrix.fillScreen(matrix.Color333(0, 0, 0));
          digitalWrite(12, LOW);
          delay(50);
          digitalWrite(12, HIGH);
          }
       
        newPrint = false;                               // New RGB print disabled

        delay(500);
        matrix.fillScreen(matrix.Color333(0, 0, 0));
          //digitalWrite(12, LOW);
         // delay(50);
          digitalWrite(11, HIGH);
    }
    index = 0;                              // Restart the storage of characters from 0
    index1 = 0;
    //
    delay(500);
    matrix.fillScreen(matrix.Color333(0, 0, 0));
 
          digitalWrite(11, HIGH);
}

Because my project is all about getting numbers from Serial Port, for that I’m sending the numbers from the Arduino program directly from: Tools>Serial Monitor

I just write some numbers on the Serial Monitor upper text box and make sure they look good on the display panel.

You can change font size from this line ( 1, 2 or 3 )

matrix.setTextSize(1);

Now let’s see what happened with me:

Typing number 4 one time with font size 1: (If not shown see attachment LED Panel1)


Typing number 4 three times with font size 1: (If not shown see attachment LED Panel2)



Typing number 4 one time with font size 2: (If not shown see attachment LED Panel3)



Have fun trying the code with your panel if it’s ¼ Scan Rate
And I think it will work fine if your panel is 16x32.

Please share your experience and surprise me if it works with your 32x32 Display Panel.

If you have the (32x32 ¼ scan rate Dip Type) one which has A & B pins and no C & D,
You are more than welcome to solve this issue together,

Thank you everyone