Updated design with SK9822-EC20 HDR RGB LEDs! I can't update the title without changing the product link.

Fibonacci128 is a beautiful 86mm circular disc with 128 SK9822-EC20 HDR RGB LEDs surface mounted in a Fibonacci layout.

I have created several LED art pieces in Fibonacci patterns. They are all very labor intensive to create, and so are fairly expensive and limited in quantity. I wanted to come up with a Fibonacci layout that was at least slightly easier to create, and therefore more affordable.

I have RGB LEDs in just about every form they come: strips, strings, rings, discs, etc. The LEDs on most discs are arranged in very regular rings. Fibonacci64 is different. The LEDs are arranged in a Fibonacci distribution. The makes the layout very organic and seemingly messy. But with the proper animation, spiral patterns emerge with spectacular results.

Each of the 128 SK9822-EC20 HDR RGB LEDs has its own decoupling capacitor built in to reduce noise. The top and bottom of the PCB are large 5V and GND planes, to allow for the large amount of current required by the 128 LEDs. Two separate three-pin headers are provided. One for 5V, Data In, and GND, and the other for 5V, Data Out, and GND. The Data Out pin can be used to connect to even more LEDs.

Case Options

The open case is built with 3mm black LED acrylic diffuser, black nylon M3 standoffs, black metal M3 screws, and 3D printed back plate with wall mounting hole. Available as kit or fully-assembled.

The white 3D printed case is still a work in progress, but the files are available on Thingiverse and Prusa Printers.

Specifications

• Size: 3.39 x 3.39 x .063 inch (86 x 86 x 1.6 mm)
• 2 layer printed circuit board
• FR4 substrate
• Green SMOBC (solder mask over bare copper)
• HASL (Hot Air Solder Leveling) Finish
• Designed in the USA by Evil Genius Labs
• Some PCBs are manufactured in the US by OSH Park in their After Dark (clear soldermask on a black substrate for stylish boards) finish!
• Some are assembled in the US by Evil Genius Labs
• Some are assembled in the US by ElectroMage

Parts

Options available to purchase for additional amount:

• Diffuser: 3mm black LED acrylic 90mm circle.
• Open Case: diffuser, M3 black nylon standoffs, M3 black metal screws, and 3D printed back plate with wall mounting hole.
• Fully Assembled: diffuser, open case, and assembled Adafruit QT Py SAMD21 controller.

The "Fully Assembled" option requires, but does not include, a USB C cable and power source (USB port, AC power adapter, battery pack, etc).

If the "Fully Assembled" option is not chosen, these parts are not included, but are required to assemble and use:

• Microcontroller (Arduino, ESP8266, ESP32, etc):
• Pixelblaze by ElectroMage
• Adafruit QT Py SAMD21 controller
• Power supply, or run off of USB power from microcontroller.
• Wires, connectors, crimp tool, etc.
• Soldering iron, solder, etc.

Parts I used in my builds:

• Adafruit QT Py SAMD21 controller
• USB power from microcontroller, with FastLED's power management to limit the maximum brightness and keep total current draw under 2A.
• Chemcast Black LED Acrylic

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