The Big Round CubatronTM
The BRC v2.0 is the world's largest 3-dimensional full color dynamic light sculpture. It is an array of lights 40 feet in diameter and 10 feet high. It consists of 28 spokes, each of which is 24 lights wide by 10 lights high. Each light is independently controllable to display any color and brightness level and the entire display can be updated 50 times per second. There are 6720 total lights (28 * 24 * 10) made of 20,160 LEDs. The BRC was originally funded by a Burning Man Art Grant.
The BRC v2.0 was at Nocturnal Wonderland in downtown Los Angeles, CA, Sept 29, 2007.
The BRC v2.0 was at Burning Man 2007 with much updated visual effects.
The BRC was at Horning's Hideout with the String Cheese Incident, outside of Portland, Oregon, July 26-29, 2007.
The BRC was on display at the Coachella Music and Arts Festival, April 27-29, 2007.
Made its debut at Burning Man 2006, August 28-Sept 3.
The physical structure that holds up the lights consists of two pieces, a central mast, and a circular wall of poles. The lights are strung horizontally and from the central mast to the outer posts:
The central mast is a 10 foot 4x4 inch wood pole standing vertically in the center. It is supported by 1/8" steel cables that run from the top of the mast to the top of each outer pole.
The poles around the circumference are 1-3/8" diameter pipe and 10 feet high. They are pre-assembled into 14 "squares" along with some 3/4" EMT pipe to keep the squares together The squares are held to the ground in each corner by rebar stakes. The tops of the squares are pulled tight and held down with rope and rebar stakes.
The light string wires are attached to the poles at 10 inch height intervals using plastic wire ties and paper clips. The bottom string of lights starts about 3 feet off the ground.
A small viewing tower was located to one side of the sculpture. It was built from some scaffolding two tiers high (10 ft), allowing people to view the sculpture from an eye level of around 15 feet high.
The light strings are based on an improved version of the design used in the Cubatron Jr. They are a slightly customized version of Triklits. The controller consists of 5 parallel microcontrollers which read preprogrammed patterns from SD memory cards and send them to the lights. The controllers are synchronized over an rs-485 connection. Each light consists of an RGB LED that can be set to a 24-bit color value and changed 50 times per second.
The software and effects are written in C and testing is done using a custom 3-D graphics simulator that runs on a PC. There are currently about 40 different effects lasting about a minute each, and the show loops continuously.
The total power required if everything is at maximum brightness is around 4500W.
A 240v/30A circuit is required to operate the BRC. This is converted to 10vdc at 400A by 4 power supplies.
At some installations the BRC was solar powered by Energy Efficiency Inc.. An array of panels charges a large battery bank during the day, and the BRC runs off the 12vdc from the batteries at night.