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apress/deploy/uno-q/skills/linux-led/SKILL.md
T
Omar SobhandClaude Opus 4.8 62c435c648 feat(uno-q): bundle the granular skill set alongside arduino-uno-q on every node
Vendors the fork's 11 granular UNO Q skills (bridge, flashing, led-matrix,
uno-q-hardware, sketch-patterns, modulino, linux-led, audio, vision, wireless,
arduino-app-lab) next to the comprehensive arduino-uno-q skill, and installs the
whole set into every agent's workspace on each board.

Why both: the comprehensive skill is the rich cloud reference (read_skill →
references); the granular skills are keyword-triggered and match the fork's eager
skill-inliner rules, so the on-board Qwen auto-inlines them (no read_skill
round-trip). flashing + led-matrix carry the exact uno_q_flash + frame-API /
ArduinoGraphics-not-installed detail that makes flashing reliable.

- push-skill.sh generalized: a single skill dir (has SKILL.md) OR a parent dir
  installs every skill under it; provision-fleet now ships all of skills/.
- Verified on board 65301572: cloud/Sonnet-5 lists all 12 skills.

Co-Authored-By: Claude Opus 4.8 <[email protected]>
2026-07-16 09:32:11 -07:00

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name, description
name description
linux-led The Arduino Uno Q's MPU-side RGB LEDs, driven from Linux via /sys/class/leds (active-low). Load this to control the on-board Linux LEDs, as opposed to LEDs wired to Arduino pins.

Linux-side RGB LEDs (MPU)

The Uno Q has RGB LEDs owned by the MPU (Linux), exposed under /sys/class/leds/* (e.g. red:user, green:user, blue:bt). These are separate from the MCU-owned LEDs you drive with digitalWrite/analogWrite in a sketch.

Use the sysfs_led tool

  • action=list — enumerate available LEDs.
  • action=set, led=<name>, brightness=0..255 — set brightness in natural sense (0 = off, 255 = full). The tool handles the active-low inversion and scales to each LED's max_brightness for you.

Under the hood

The LEDs are active-low: writing 0 to <led>/brightness turns it fully ON, max_brightness turns it OFF. sysfs_led inverts your natural-sense value so you never have to think about it.

Which LED tool to use

  • On-board Linux RGB LEDs → sysfs_led (this skill).
  • LEDs wired to Arduino pins, or the built-in D13 → flash a sketch with uno_q_flash, or toggle via gpio_write on a running sketch.
  • The 13×8 blue LED matrix → the led-matrix skill (it's an MCU device).