Hardware

LED

Use P2.5 full-color LED display module, often used in weddings, concerts and other large screens, compatible with P3 and other LED sizes
Size: 160mm x 160mm
Point spacing: 2.5mm
LED Package: SMD 2121
Number of LEDs: 64 x 64
Weight: 0.2kg
Interface： HUB75E
Optimum viewing distance: 1-15M
Operating temperature: -25-50℃

ESP32

ESP32 is a high-performance, low-power Wi-Fi and Bluetooth dual-mode system-on-chip (SoC) launched by Espressif Systems, it is widely used in the fields of Internet of Things, smart home, wearable devices, etc. It is based on the extremely low-power Tensilica Xtensa LX6 microprocessor and integrates a wealth of peripherals and sensor interfaces

PCB

The HUB75 terminal has many connections, I designed an integrated PCB adapter board according to the size of the LED module. While connecting the ESP32 and the HUB75 terminal, I also added a LDR position and added an independent power supply

HUB75 terminal - ESP32 30pin connection diagram

HUB75 terminal - ESP32 38pin connection diagram

LDR

Connect a GL5539 photoresistor and a 10K voltage divider resistor so that the clock can automatically adjust the display brightness according to the ambient light brightness

Power Supply

Independent power supply to prevent high current from burning out the diode on the ESP32 development board