SparkFun
SparkFun LuMini LED Ring - 2 Inch (40 x APA102-2020)
The SparkFun LuMini LED Ring (2 Inch) features 40 individually addressable APA102-2020 RGB LEDs in a compact ring form factor. Each LED can produce over 16 m...
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The SparkFun LuMini LED Ring (2 Inch) features 40 individually addressable APA102-2020 RGB LEDs in a compact ring form factor. Each LED can produce over 16 million colours, and the miniaturised 2 mm × 2 mm package allows for tight pixel density and a near-continuous ring of colour.
The ring is controlled via SPI (data + clock) through solder pads on the back of the board. Multiple rings can be daisy-chained by connecting the data/clock output of one to the input of the next. Eight detachable mounting tabs (four inside, four outside) can be used to secure the ring or broken off for more complex designs.
Key Features
- 40× APA102-2020 LEDs – Individually addressable RGB with 16 million colours
- 2 mm × 2 mm LED Package – High pixel density for smooth colour transitions
- SPI Control – Separate data and clock lines for reliable communication
- Chainable – Data/clock output pads for daisy-chaining multiple rings
- Detachable Mounting Tabs – 8 breakaway mounting points for flexible installation
- 5 V Operation – Powered via solder pads on the back
Specifications
- LED Count – 40
- LED Type – APA102-2020 (2 mm × 2 mm)
- Ring Diameter – 2 inches (~51 mm)
- Operating Voltage – 5 V
- Interface – SPI (data + clock)
Ideal For
- Wearable electronics and costumes
- Status indicators and visual feedback rings
- Art installations and decorative lighting
- Clock and gauge displays
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- RGB
- Short for red, green and blue, the three primary colours of light that are mixed in varying amounts to make a wide range of colours. In electronics RGB can refer to an LED or pixel that blends these three colours, or to a colour signal or interface that carries separate red, green and blue channels.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
Find this product in
Brands
LuMini 2 Inch Ring Schematic
Schematic · 99.9 KB · Click any page to view full size
APA102-2020 LED Datasheet
Datasheet · 7.7 MB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 473.6 KB · Click any page to view full size
LuMini 3Inch
Schematic · 115.5 KB · Click any page to view full size
LuMini 1Inch
Schematic · 76.1 KB · Click any page to view full size
Resources & Downloads
Guides, code examples, and more
LuMini 2 Inch Eagle Design Files
Schematic · ZIP · 122.8 KB
Eagle PCB design files for the SparkFun LuMini 2" LED ring
FastLED Arduino Library
Example Code · ZIP · 25.8 MB
FastLED library for controlling addressable LEDs with Arduino
LuMini 3Inch
Schematic · ZIP · 130.3 KB
LuMini 1Inch
Schematic · ZIP · 115.3 KB
Related Tutorials
Free guides on learn.littlebird.com.au
