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Arduino 3D Printing LED

LED Matrix Clock with Arduino

LED Matrix Clock with Arduino

This project combines 3D printing and Arduino to create a stunning LED matrix clock that fits right in with the synthwave aesthetic.

Parts List

  • Arduino Nano
  • MAX7219 LED Matrix (4 modules)
  • DS3231 RTC Module
  • 3D Printed Case (PLA)
  • Jumper Wires
  • USB Cable

The Build

The case was designed in Fusion 360 with a retro-inspired angular shape. The front panel has a slot for the LED matrices, and the back has openings for the USB port and a button for setting the time.

Wiring

The wiring is straightforward - the MAX7219 modules daisy-chain together and connect to the Arduino via SPI:

MAX7219 DIN  -> Arduino D11
MAX7219 CS   -> Arduino D10
MAX7219 CLK  -> Arduino D13
DS3231 SDA   -> Arduino A4
DS3231 SCL   -> Arduino A5

Code

The Arduino code uses the MD_Parola library for the LED matrix and the RTClib for the real-time clock module.

Result

The finished clock looks amazing on the desk! The LED matrices are bright and easy to read, and the 3D printed case gives it a clean, professional look.

What I Learned

  • How to daisy-chain MAX7219 modules
  • Designing enclosures with proper tolerances for electronics
  • Using the DS3231 RTC for accurate timekeeping