ESP32-HUB75-32X16-P10-SMD-1/4SCANRATE-LEDMODULE MULTIPLES

[Oswaldo-sudo]

Hello to everyone!

I am becoming a little too excited with the idea to build a big display with these modules, I am working with modules with the FM6124DJ chip, 1/4 scan rate, 32x16. By looking through some of the libraries I manage to turn them on just to test my power supply (LRS-350-5), my esp32 and the cables, but no idea how to actually make letters and figures to show. So far, all that I can do is to make them turn on random lights, and it doesn't seem to refresh anything.

The idea that I cannot possibly get out of my head is to build an array of 4x6 of these modules (the link from where I got them: https://es.aliexpress.com/item/1005008345547054.html?spm=a2g0o.order_list.order_list_main.5.22b3194d19diCP&gatewayAdapt=glo2esp) to make messages appeared on the background with a transition animation like: "HELLO" coming from a side, or a big figure in the middle of the display.

I understand that I need to make adjustments on the libraries to make it work for this display, but I am having troubles doing it maybe I need a different approach.

[mrcodetastic]

Can you provide close-up photos or the text on the black chips at the back where the HUB75 connector is? That's what will determine how these panels need to be driven. Have a look at similar issues about panels like this and there's a general process to getting panels to work.

[Oswaldo-sudo]

the chips near the hub75 are labeled as "74HC245KAJ NGK612000", the ones on the top and bottom of the panel are labeled as "6124DJ NGH744000" (Tried to take pictures but my phone camera is not really that good)

[Oswaldo-sudo]

My main issue is that I can´t seem to find a configuration to make a single led panel to work as intended, it always turn on random leds, at static colors

For example if I try to turn one led red, instead a random section turns on in many colors

[board707]

@Oswaldo-sudo
Hi
Could you provide a full view photo of the panel rear side?

[Oswaldo-sudo]

[board707]

Thanks.
It looks like your panel has a direct line switching without multiplexor chips.
But it does not explain why, when displaying a single dot, you get pixels of random color and location. It shouldn't be this way.
Please show the code, in which you output a single pixel to display.

[Oswaldo-sudo]

`/*************************************************************************
Description:

The underlying implementation of the ESP32-HUB75-MatrixPanel-I2S-DMA only
supports output to HALF scan panels - which means outputting
two lines at the same time, 16 or 32 rows apart if a 32px or 64px high panel
respectively.
This cannot be changed at the DMA layer as it would require a messy and complex
rebuild of the library's internals.

However, it is possible to connect QUARTER (i.e. FOUR lines updated in parallel)
scan panels to this same library and
'trick' the output to work correctly on these panels by way of adjusting thedisplay
pixel co-ordinates that are 'sent' to the ESP32-HUB75-MatrixPanel-I2S-DMA
library.

**************************************************************************/

/* Use a custom Virtual Display class to re-map co-ordinates such that they draw
correctly on a 32x16 1/4 Scan panel (or chain of such panels).
*/
#include <ESP32-VirtualMatrixPanel-I2S-DMA.h>

#define R1_PIN 4
#define G1_PIN 12
#define B1_PIN 13
#define R2_PIN 14
#define G2_PIN 15
#define B2_PIN 21

#define A_PIN 16
#define B_PIN 17
#define C_PIN 5
#define D_PIN 18
#define E_PIN -1 // IMPORTANT: Change to a valid pin if using a 64x64px panel.

#define LAT_PIN 32
#define OE_PIN 33
#define CLK_PIN 27

/* ================================================== */
// Define custom class derived from VirtualMatrixPanel
class EightPxBasePanel : public VirtualMatrixPanel
{
public:
using VirtualMatrixPanel::VirtualMatrixPanel; // inherit VirtualMatrixPanel's constructor(s)

protected:
VirtualCoords getCoords(int16_t x, int16_t y); // custom getCoords() method for specific pixel mapping
};

// define custom getCoords() method for specific pixel mapping
inline VirtualCoords EightPxBasePanel::getCoords(int16_t x, int16_t y) {
coords = VirtualMatrixPanel::getCoords(x, y); // first call base class method to update coords for chaining approach

if (coords.x == -1 || coords.y == -1) { // Co-ordinates go from 0 to X-1 remember! width() and height() are out of range!
return coords;
}

uint8_t pxbase = 8; // pixel base

if ((coords.y & 4) == 0) {
coords.x += ((coords.x / pxbase) + 1) * pxbase;

} else {
coords.x += (coords.x / pxbase) * pxbase;
}

coords.y = (coords.y >> 3) * 4 + (coords.y & 0b00000011);
return coords;
}
/* ================================================== */
// Panel configuration
#define PANEL_RES_X 32 // Number of pixels wide of each INDIVIDUAL panel module.
#define PANEL_RES_Y 16 // Number of pixels tall of each INDIVIDUAL panel module.

#define NUM_ROWS 1 // Number of rows of chained INDIVIDUAL PANELS
#define NUM_COLS 1 // Number of INDIVIDUAL PANELS per ROW

// ^^^ NOTE: DEFAULT EXAMPLE SETUP IS FOR A CHAIN OF TWO x 1/8 SCAN PANELS

// Change this to your needs, for details on VirtualPanel pls read the PDF!
#define SERPENT false
#define TOPDOWN false
#define VIRTUAL_MATRIX_CHAIN_TYPE CHAIN_NONE

// placeholder for the matrix object
MatrixPanel_I2S_DMA *dma_display = nullptr;

// placeholder for the virtual display object
EightPxBasePanel *FourScanPanel = nullptr;

/******************************************************************************
Setup!
******************************************************************************/
void setup() {
delay(250);

Serial.begin(115200);
Serial.println("");
Serial.println("");
Serial.println("");
Serial.println("");
Serial.println("* 1/4 Scan Panel Demonstration *");
Serial.println("");

HUB75_I2S_CFG::i2s_pins _pins = { R1_PIN, G1_PIN, B1_PIN, R2_PIN, G2_PIN, B2_PIN, A_PIN, B_PIN, C_PIN, D_PIN, E_PIN,LAT_PIN, OE_PIN, CLK_PIN};

HUB75_I2S_CFG mxconfig(
PANEL_RES_X * 2, // DO NOT CHANGE THIS
PANEL_RES_Y / 2, // DO NOT CHANGE THIS
NUM_ROWS * NUM_COLS // DO NOT CHANGE THIS
,_pins // Uncomment to enable custom pins
);

mxconfig.clkphase = true; // Change this if you see pixels showing up shifted wrongly by one column the left or right.

//mxconfig.driver = HUB75_I2S_CFG::FM6126A; // in case that we use panels based on FM6126A chip, we can set it here before creating MatrixPanel_I2S_DMA object

// OK, now we can create our matrix object
dma_display = new MatrixPanel_I2S_DMA(mxconfig);

// let's adjust default brightness to about 75%
dma_display->setBrightness8(10); // range is 0-255, 0 - 0%, 255 - 100%

// Allocate memory and start DMA display
if (not dma_display->begin())
Serial.println("****** !KABOOM! I2S memory allocation failed ***********");

dma_display->clearScreen();
delay(500);

// create FourScanPanel object based on our newly created dma_display object
FourScanPanel = new EightPxBasePanel((*dma_display), NUM_ROWS, NUM_COLS, PANEL_RES_X, PANEL_RES_Y, VIRTUAL_MATRIX_CHAIN_TYPE);

// THE IMPORTANT BIT BELOW!
// FOUR_SCAN_16PX_HIGH
// FOUR_SCAN_32PX_HIGH
// **** You don't need to set PhysicalPanelScanRate when use your own virtual panel class
//FourScanPanel->setPhysicalPanelScanRate(FOUR_SCAN_16PX_HIGH);
}

// Test the pixel mapping - fill the panel pixel by pixel
void loop() {
FourScanPanel->drawPixel(1, 1, FourScanPanel->color565(100, 0, 0));

} // end loop`

[board707]

And what you see on the panel when run this code?

[Oswaldo-sudo]

That´s the weird part
It varies, sometimes a section of the panel lights on, sometimes a line appears, sometimes it doesn´t do anything

If I add logs to the loop I can see that it is running

[Oswaldo-sudo]

by changing the loop for this:

void loop() {
Serial.println("****** Again ***********");
for (int i = 0; i < FourScanPanel->height(); i++) {
for (int j = 0; j < FourScanPanel->width(); j++) {
FourScanPanel->drawPixel(j, i, FourScanPanel->color565(100, 0, 0));
delay(30);
}
}
}

[Oswaldo-sudo]

trim.31673268-D953-46F1-934E-4C98172B8BD8.MOV

I get this constant green section turn on

[board707]

Sorry, it doesn't look like anything I seen before. Perhaps something incorrect in your setup or connection. I recommend you check everything. May be it would be a good idea to try some different libraries.

[Oswaldo-sudo]

I noticed that by connecting and disconnecting ground it does appear to be moving

Is there a setting for frequency that I need to tune in a little bit?

[mrcodetastic]

Can you test with the PxMatrix library?