RGB LED ring based christmas tree based on the SK6812.

Rings

Each ring has 4 connectors, data in, data out, GND and 5V. The first/bottom ring data in is connected to the GPIO of the ESP32 (via the 74AHCT125). The data out is connected to the next ring on data in.

74AHCT125N

Used to connect the 3.3V of the ESP32 side to the 5V data side of the LED rings.

datasheet

Diagram

See https://wled.discourse.group/t/esp32-sn74ahct125n-wiring-max-length-data-cable-to-sk6812/2294 but I used a 470 ohm resistor as shown here.

Mechanical parts

• M3x12
• M3 threaded inserts

Electrical parts

• SK6812 Digital 5050 RGB LED Ring - 93 LEDs - Black
• Wemos C3 Mini - ESP32-C3 - v1.0.0 (discontinued, use v2.1.0)
• SN74AHCT125N 4-channel Level Converter - 3.3V to 5V - 14-pin DIP
• Mean Well Power Supply - 5V 3A - Switching Power Supply - RS-15-5
• IEC C14 connector with fuse (same as your PSU on the PC) (no clue where I bought it, looks like this one but with on/off switch)