ESP32 LED Matrix Clock & Weather Display

This project displays the current time, temperature, and humidity on a 4-module MAX7219 LED matrix, powered by an ESP32 and a DHT22 sensor.

Features

• Real-time clock via NTP (with DST support for Europe)
• Temperature and Humidity reading via DHT22
• Alternating display between time and climate every few seconds
• Smooth scrolling text on MAX7219 32x8 LED matrix

Hardware Used

• ESP32 (e.g. NodeMCU ESP32)
• 4× MAX7219 8×8 LED matrix modules (FC16-compatible)
• DHT22 temperature & humidity sensor (AM2302)
• 5V power supply (MAX7219 must be powered with 5V!)

Wiring

Component	ESP32 Pin
MAX7219 DIN	GPIO 23 (MOSI)
MAX7219 CLK	GPIO 18 (SCK)
MAX7219 CS	GPIO 5
MAX7219 VCC	5V (Vin)
MAX7219 GND	GND
DHT22 Data	GPIO 4
DHT22 VCC	3.3V or 5V
DHT22 GND	GND

Note: Add a 10k pull-up resistor on the DHT22 data line if needed.

Libraries

Install the following PlatformIO libraries:

• DHT sensor library
• MD_Parola
• MD_MAX72XX