---
description: "Me documenting my 64x64 LED matrix display"
created: 2025-03-11
---

![Main](Main.webp)

## Display documentation

### From Aliexpress seller

[64x64 Indoor RGB HD P3 Led Module Video Wall High Quality P2.5 P4 P5 P6 P7.62 P8 P10 Panel Full Color Display - Aliexpress.com](https://www.aliexpress.com/item/32757647402.html)

Key                       | Value
------------------------- | -----------------------------------
Item                      | P3
Chip                      | Epstar
Chip size                 | Red 9 mil, Green 12. Blue 12mil
Light type                | SMD2121
Pixel Pitch               | 3mm
Module Size               | 192mmX192mm
Module Resolution         | 64 X 64 (dots)
Density of pixel          | 111111dots/m2
Pixel configuration       | 1R1G1B
Red wavelength            | 625±2nm
Green wavelength          | 525±2nm
Blue wavelength           | 470±2nm
Colors                    | 16777216
Best viewing distance     | ≥2m
viewing angle             | 120°/90°
Maximum power consumption | 20W
Brightness                | 1500cd/m2
Gray scale                | 14bits per color
Color temperature         | 6500k
Control method            | Synchronization or Asynchronization
Driving method            | 1/32 scanning
Frame frequency           | 60Hz
Refresh frequency         | ≥600Hz
Working Voltage           | DC5V
IP grade                  | IP54
MTBF                      | More than 8000hours
Life Span                 | 80,000hours


### Chips

1. CHIPONE `ICN74HC245TS` `A14276CA`
2. `MBI5124GP` `A3YN72CTHB`
3. `RUC7258` `8W913170`

![Chip 1](Chip 1.webp)
![Chip 2](Chip 2.webp)
![Chip 3](Chip 3.webp)

### Display IN connector

![In left](In left.webp)
![In right](In right.webp)

---

## Micro controller wiring

I use an [ESP32 WEMOS LOLIN S2 Mini](https://docs.platformio.org/en/latest/boards/espressif32/lolin_s2_mini.html)
which has an ESP32-S2F chip on it

![ESP32-S2F_chip](ESP32-S2F_chip.webp)

Display in wiring

```
    ┌────────┐
R1  ┤  1  40 ├ G1
B1  ┤  2  38 ├ N
R2  ┤  4  36 ├ G2
B2  ┤  6  34 ├ LE
LA  ┤  8  21 ├ LB
LC  ┤ 10  17 ├ LD
CLK ┤ 13  15 ├ LAT
OE  ┤ 14   ⏚ ├ GND
    └────────┘
```

![ESP32 S2 Mini](ESP32 S2 Mini.webp)

---

## PCB Connector board

The screen glitches unless you have a solid connection.

This PCB is a straight connection, except the gnd which is flipped with the adjacent pin.

![esp32_display_pcb_top_plugged_in](esp32_display_pcb_top_plugged_in.webp)
![esp32_display_pcb_bottom](esp32_display_pcb_bottom.webp)

Half the display glitched out, untill i added a 100pf capacitor between `lat pin` and `gnd`
as per:
<https://github.com/mrcodetastic/ESP32-HUB75-MatrixPanel-DMA/issues/130#issuecomment-867116753>

---

## Software

<https://github.com/mrcodetastic/ESP32-HUB75-MatrixPanel-DMA>

```c++
#define R1_PIN   1
#define G1_PIN  40
#define B1_PIN   2
#define R2_PIN   4
#define G2_PIN  36
#define B2_PIN   6
#define A_PIN    8
#define B_PIN   21
#define C_PIN   10
#define D_PIN   17
#define E_PIN   34 // required for 1/32 scan panels, like 64x64px. Any available pin would do, i.e. IO32
#define LAT_PIN 15
#define OE_PIN  14
#define CLK_PIN 13

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(
	64, // Module width
	64, // Module height
	1, // chain length
	_pins, // pin mapping
);
dma_display = new MatrixPanel_I2S_DMA(mxconfig);
```

---

I'm still experiencing some glitching, especially on the lower half of the display,
albeit a better PSU made the problem go away for static sketches, plasma still struggles.