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.
- 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
![[svg]](/brainsmoke/chiral_sphere/blob/main/pcb/yjoint/penta_joint.svg){kind=link}
![[svg]](/brainsmoke/chiral_sphere/blob/main/pcb/yjoint_v2/penta_joint_v2.svg){kind=link}
- 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.
Add extra capacity to the strip which needs to handle the most Amps.
