Simple DMX video projector shutter

INFO 20/01/2026:
V2 with OLED screen and programmable function is here:
https://www.thingiverse.com/thing:7273950

This is a very simple DMX shutter for video projector when there is a need to cut out VP beam for total dark on stage (even a dark image produce some light).
It sit on top of the VP and a servo controlled palette come in front of the lense when needed.
While there is a lot of possibilities to control a video projector shutter, I prefer DMX solution because you can easily control the shutter far away from PC or light console with a simple XLR cable. It is cheap and reliable.

You'll need:

-the 3D enclosure: 2 files included, the box and the cover, print 0.2 with support for the box. They must be glued or taped together.
-the Arduino sketch: included, you'll need FTDI to program.
-the PCB: Gerber included, I use JLCPCB, just upload the zip, less than 5 euros for 5 PCB.
-Max 485 breakout board
-Arduino pro mini
-FDTi 292 for Arduino programming
-USB-C connector for 5V alim,