fix: replace reverse-mount SK6812MINI-E with top-mount SK6812MINI-HS

[thePunderWoman]

Why

D_RGB1 is mounted lens-up, but the SK6812MINI-E is a reverse-mount part. Its footprint used the datasheet's bottom-view land pattern, which is only correct when the LED is mounted lens-down through a hole, and it had no body cutout. Mounted lens-up, the pins were mirrored: neither 0° nor 180° put any pin on the right net. The leads also come out of the middle of the body, so the part couldn't reach its pads on a flat board.

This came up when PCBWay asked whether the footprint's triangle marks pin 1.

What changed

Switched to the OPSCO SK6812MINI-HS (LCSC C2922787, ~69k in stock at JLC, Extended). It's a flat-bottom 3.5 × 3.5 mm top-mount PLCC4 with the same pins and single-wire protocol, so the circuit and firmware are unchanged.

• New footprint SnipsControllers_Custom:SK6812MINI-HS-012, built from datasheet SK6812MINI-HS-012 Rev B/0 §6 (top view).
  • 1.5 × 1.0 mm pads, 1.8 mm column gap, 0.8 mm row gap.
  • Pad numbers are the datasheet's pin numbers: 1 GND (lower right, chamfered corner, marked with the silkscreen triangle), 2 DIN, 3 VDD, 4 DOUT.
  • Checked with the pcb-design skill's footprint checker (footprint_geometry.py --pins).
  • 3D model is KiCad's 3535 WS2812B-Mini body, rotated 180° so its pin-1 corner sits on pad 1.
• Stackup: local sk6812mini-hs part in parts.kdl; D_RGB1 placement and purchasing entry updated. The 3.3 V supply is still below the datasheet's 3.7 V minimum, the same as with the MINI-E, and is acknowledged with an ignore.
• PCB: synced from Stackup with the v0.2.0 plugin and the LED re-routed. Most of the PCB diff is the Stackup Source line-number property shifting by one on every part.
• Production files: regenerated. The JLC BOM lists D_RGB1, C2922787 and the CPL has D_RGB1 at rotation 0 on top. snips_controller-all.pos had been stale since August and is regenerated with kicad-cli.
• Removed: the unused MINI-E footprint, and SK6812MINI-E_RGB_LED_with_integrated_controller.pdf, which was actually the 5050 SK6812 datasheet. Added the MINI-HS datasheet.

Checks

• stackup check PCB/stackup/board.kdl --locked: 0 errors, 0 warnings
• ci/check_pcb_sync.py: PCB matches Stackup
• kicad-cli pcb drc --refill-zones: 0 violations, 0 unconnected

Before ordering

• Tell PCBWay about the part change and that the triangle marks pin 1 = GND (datasheet §5).
• Confirm pin 1 at the triangle in the assembler's placement preview.

🤖 Generated with Claude Code