panel chain limit?(chained more than 7 doesn't work)

[Jiwno]

Is there a limit of chained panel number?

I'm trying to chain 12 panel(96 * 48 pixels) with one esp32 but if I chain more than 7 panel at once, it doesn't work at all.

I checked the power and it wasn't power problem.

I'm using 96 * 48 pixels panel in a row.

[Jiwno]

#include <ESP32-HUB75-MatrixPanel-I2S-DMA.h>

#define PANEL_RES_X 96 // Number of pixels wide of each INDIVIDUAL panel module. #define PANEL_RES_Y 48 // Number of pixels tall of each INDIVIDUAL panel module. #define PANEL_CHAIN 7 // Total number of panels chained one to another #define PIN_E 32

//MatrixPanel_I2S_DMA dma_display; MatrixPanel_I2S_DMA *dma_display = nullptr; uint16_t myWHITE = dma_display->color565(255, 255, 255);

void setup() { Serial.begin(115200);

// Module configuration HUB75_I2S_CFG mxconfig( PANEL_RES_X, // module width PANEL_RES_Y, // module height PANEL_CHAIN // Chain length ); mxconfig.gpio.e = PIN_E;

// Display Setup dma_display = new MatrixPanel_I2S_DMA(mxconfig); dma_display->begin(); dma_display->setBrightness8(90); //0-255 dma_display->clearScreen(); dma_display->fillScreen(myWHITE); }

void loop() { // dma_display->fillScreen(myWHITE); dma_display->clearScreen();

for (int y=0; y<PANEL_RES_Y; y++){ for (int x=0; x<PANEL_RES_X * PANEL_CHAIN; x++){ dma_display->drawPixelRGB888(x, y, 255, 255, 255); delay(1); } } }

This it the code I'm running

[board707]

Is there a limit of chained panel number?

There is no chain limit , but there is a limit of memory used. Your panel size 96x48 is quite large, chaining 12 of them will create a screen with 580x96 dimensions. I think this required too much memory for work. Start from decreasing of colour depth to, for example, 3-4 bits per color

[Jiwno]

Oh, I got it. Thanks