One Inch Fibonacci128 is a tiny, beautiful 25.4mm circular disc with 128 1mm WS2812B RGB LEDs surface mounted in a Fibonacci distribution.

It consists of 128 XINGLIGHT XL-1010RGBC-WS2812B 1mm addresssable RGB LEDs, arranged into a circular Fermat's spiral pattern.

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. One Inch Fibonacci128 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.

The XINGLIGHT XL-1010RGBC-WS2812B each only consume a maximum of 15mA, and that's at 100% brightness, solid white color. That's only 1.92A for all 128 combined. They are still very bright, and I usually only run them at about 25% brightness. They're perfect for wearables, powered with LiPo batteries.

It has solder pads on the back that match the pinout of the QT Py by Adafruit, or XIAO by Seeed. It can be used by any microcontroller via the 5V, GND, and Data In pins.

The three mounting holes are surrounded by capacitive touch compatible pads. They're connected to the A3, A6 & A7 pads/pins on the QT Py footprint. The SAMD21 QT Py supports capacitive touch on these pins.

Options

The open case is built with 3mm black LED acrylic diffuser, 3D printed PETG back plate, black M2x10mm screws, and black M2 nuts. Available as kit or fully-assembled.

Specifications

• Size: 1 x 1 x .063 inch (25.4 x 25.4 x 1.6 mm)
• 2 layer printed circuit board
• FR4 substrate
• Black SMOBC (solder mask over bare copper)
• HASL (Hot Air Solder Leveling)
• Designed in the US by Evil Genius Labs

Parts

Options available to purchase for additional amount:

• Diffuser: 3mm black LED acrylic 29mm circle.
• Open Case Kit: diffuser, back cover, M2 hardware.
• Fully Assembled: diffuser, open case, and assembled QT Py by Adafruit 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)
• Wires, connectors, crimp tool, etc.
• Soldering iron, solder, etc.

Parts I used in my builds:

• QT Py by Adafruit
• Chemcast Black LED Acrylic

Assembly Instructions