LED lamp based on a chiral spherical tiling consisting of 20 triangles and 12 Pentagons where the edge-length ratio triangle:pentagon is 2:1.

Video

• 2x 5m WS2812 LED strips, 60 LEDs/m spacing, 10mm wide, cut into 30 strips of 17
• +/- 11 meters flexible diffuser, 12mm wide
• custom joint PCBs [kicad] [svg], untested flexpcb alternative [kicad] [svg]
• LED driver board, LED driver board v2
• thin wire (for connecting the data lines)
• 2x ~30cm thick wire (to handle high currents near the power connector)
• 3mm plywood, 4x 600x400mm
• white paint
• wood glue

• Formula for the relation between corner arc and edge-length for regular N-gons on the unit sphere
• Calculation of the corner arc for this spherical tiling
• LED Locations & normals

Based on output from one of my scripts, but with the outer panels removed so that the tubes become U-profiles and the sides modified so that they trace a perfect sphere.

Laser cut shapes (with some spares; apply appropriate kerf width compensation before cutting)

All strips are positioned such that data-in is above data-out, with one pentagon chosen as top. The strips are connected as five point-symmetrical led strips with 102 LEDs each according to this OpenSCAD model.

PCB

• Driver software repo
• STM32 Firmware: strip5.bin
• LED positions
• conf/hardware.json

Add extra capacity to the strip which needs to handle the most Amps.