Connecting the Nextion LCD to Ultratronics v1.0

The Ultratronics board can be connected to the Nextion displays using the Serial2 pins. This allows you to easily add a LCD with touch screen function, without impacting the performance of the 3D printer, as the Nextion takes little CPU power away from 3D printing.


  • Ultratronics (Pro)
  • Nextion LCD
  • MK4DUO firmware (available here)
  • MicroSD card

The Nextion LCD comes with a cable that connects on one side into the LCD and at the other side has four strands:

  • Red (5V)
  • Blue (TX)
  • Yellow (RX)
  • Black (Ground)

Connect the colored wires as shown in the picture. After connecting the wire the electronic setup is done. Now proceed with uploading images to the LCD.

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