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20261025-0010-air-hub-mini-rgb-status-led Air Hub Mini: one RGB status LED instead of two LEDs

  • status: completed
  • priority: P2
  • owner: worker/session-ybo-46
  • createdAt: 2026-10-25 00:10

Description

章节标题：“Description”

On 2026-10-25 the owner asked why the Mini has two LEDs instead of one colour-changing LED ("为什么有两个灯？不是用一个led变色灯吗"). The earlier answer to "different colours" had been taken as two single-colour LEDs. This task replaces the two LEDs with one LED and one light pipe:

  • Part: Kingbright APFA3010LSEEZGKQBKC, a right-angle side-emitting RGB LED (3.0 × 1.5 × 1.0 mm, common anode). At 2 mA the forward voltage is 1.8 V for red and 2.65 V for green and blue, so a 3.3 V supply drives every colour.
  • Wiring: the anode is on +3V3. The red, green and blue cathodes go through 1 kΩ, 1 kΩ and 330 Ω to IO11, IO6 and IO7, active low. IO11 was a spare pin.
  • Placement: the LED sits on the port edge at PCB y 38.
  • Enclosure: one light pipe in the port-side wall.

The placed part count stays 47: one LED and one resistor replace the two LEDs.

Acceptance criteria:

  1. Board checks: ERC with no errors, DRC 0 (unconnected, errors, parity), EMC 0 errors.
  2. Renders: the enclosure renders show one light pipe.
  3. Docs: the reference board (§2.4, §5.4, §6.1 per-board total, §7, §7.4), the spec, the design appendix pin notes and the Mini README are updated.
  4. Quality gate: bun run docs:lint && bun run docs:build && git diff --check passes.

ActiveForm

章节标题：“ActiveForm”

Replacing the Air Hub Mini LEDs with one RGB status LED

Dependencies

章节标题：“Dependencies”
  • blocked by: (none)
  • blocks: (none)

Notes

章节标题：“Notes”

Results (2026-10-25):

  • Board: DRC 0 unconnected, 0 errors, 0 parity. Warnings: 3 library-mismatch, plus 3 silkscreen-edge warnings because the USB-C and the LED sit at the board edge.
  • EMC: 13 findings, 0 errors, 7 warnings.
  • Cost: per-board parts at 100 pcs are $18.22, up from $18.13. The change is within the rounding of the §6.1 estimate.
  • Doc versions: reference board R1.16, spec R1.20, design appendix R1.15.
  • Open:
    • LCSC does not list the LED; DigiKey and Mouser stock it. A same-footprint domestic alternative is still to be checked.
    • The colour and blink patterns for the system, pairing and radio states are a firmware decision.