The sommerhack LED sign and the LED poles all over the camp can be controlled over the network.

The LEDs are controlled by sending commands in the form of UDP packets to the LED controllers.

There are 3 controllers:

• skilt.sommerhack.dk
• strip1.sommerhack.dk
• strip2.sommerhack.dk

And (surprise), skilt.sommerhack.dk controls the sommerhack sign, and the two others controls all the LED poles.

Commands must be send to port 7890.

The command format is

• 16 bit (little-endian byte ordering) magic value 1111 (decimal)
• 16 bit (little-endian byte ordering) offset to first LED to control (value between 0 and 300)
• 24 bit x N colors. This is 3 x 8 bit RGB values, for the first LED and auto-incrementing forward.

The LED sign has 245 LED's.

The X, Y coordinates are attached on this page (maybe).

See more about the LED strips used at https://learn.adafruit.com/adafruit-neopixel-uberguide/advanced-coding

The firmware running on the LED controllers: https://github.com/rolfrm/sommerhack_led