This is a device that converts an ArtNet signal to two universes of DMX. I've tested it as working fully with QLC+ and ETC Nomad on both universes, at standard frame rates.

Apologies for the state of the Fritzing file, I'll clean it up when I can be bothered. You need to use Arduino 0023 and the bundled libraries, because some registers were renamed after Arduino 1.0.

• Two Universe ArtNet to DMX
• Option of both 5-pin and 3-pin output for both universes
• LCD Screen displaying IP address (for now, IP address needs to be manually assigned)
• RGB LED displaying online/offline state (detects being connected to network and receiving valid packets)
• Small form-factor

• Arduino Mega 2560 - £10
• Arduino Ethernet Shield - £7
• Custom PCB (PDFs available for home-etching) - Free
• 2x MAX485 - £2
• 2x Neutrik XLR Sockets (3 or 5 pins) - £6-12
• RGB 5mm Common Cathode LED - £1
• Jumper Wires - £2
• 16x2 i2c LCD - £5
• Stacking Headers
• 2x 100Ω Resistor, 1x 47Ω Resistor