Zermatt/Hardware/LED Rings
Zermatt LED Ring Hardware[edit | edit source]
May 7, 2026
Ordered Units (SK6812 RGBW Natural White ~4500K)[edit | edit source]
| PID | Description | LEDs | Price | URL |
|---|---|---|---|---|
| 2852 | NeoPixel Ring 12x RGBW Natural White | 12 | $9.50 | https://www.adafruit.com/product/2852 |
| 2855 | NeoPixel Ring 16x RGBW Natural White | 16 | $11.95 | https://www.adafruit.com/product/2855 |
| 2862 | NeoPixel Ring 24x RGBW Natural White | 24 | $19.95 | https://www.adafruit.com/product/2862 |
Why Natural White ~4500K[edit | edit source]
- Most even illumination for photometric stereo on skin
- True white phosphor (RGBW) gives cleaner white than RGB mixing
- Warm white causes yellow cast; cool white causes specular highlights
Key Specs[edit | edit source]
- Outer diameter: 66mm (24-LED ring) | Power: 5V DC, up to 1.2A | Chip: SK6812 RGBW
Datasheets[edit | edit source]
- SK6812: https://cdn-shop.adafruit.com/product-files/1138/SK6812%20LED%20datasheet%20.pdf
- WS2812: https://cdn-shop.adafruit.com/datasheets/WS2812.pdf
- WS2812B: https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf
- NeoPixel Überguide: https://learn.adafruit.com/adafruit-neopixel-uberguide
Libraries[edit | edit source]
- Adafruit NeoPixel: https://github.com/adafruit/Adafruit_NeoPixel
- FastLED: https://github.com/FastLED/FastLED | https://fastled.io/docs/
Signal Conditioning[edit | edit source]
- 470Ω resistor in series on data line (protects GPIO, prevents ringing)
- 1000µF 10V capacitor across power rails (prevents brown-out on LED inrush)