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Low priority: equalise the grid's LED brightness per channel, measured on a built board

オープン
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まだ誰も着手していません。

評価

難易度
4/5
見積もり時間
3〜5日
初心者へのやさしさ
25/100
issue の種類
機能追加
明瞭さ
おおむね明確
活発さ
活発
技術スタック
arduino, cpp, python
領域
embedded-iot

調査の方向性

Start by reading NW-Status/QUEUE.md, item 6 of "Okapi LED work, ordered", then the PCA9634 driver's wake-up path. The issue depends on a built board and a completed driver, so first confirm both exist; then photograph or meter each cell at full brightness and compute eight scaling factors. Done when those constants are written once at driver wake-up and the measurement method is recorded.

索引モデルが issue の本文から書いたものです。

説明

enhancement

Equalise the brightness of the eight LEDs on the grid, so a lit green cell and a lit red cell read as equally lit. Low priority: it waits until a board exists and the required Okapi work is done.

Why it will be needed. Each LED has its anode through 220 Ω to 3V3_CORE (R53, R60, R64, R76–R80) and its cathode on a PCA9634 output. Green's forward voltage is about a volt above red's, so at the same register value the green cells pass roughly a third of the current the red ones do, and the three colours also differ in luminous efficacy. Uncorrected, "one cell per column" will look like two bright cells and a dim one. Which LED parts were fitted is itself unverified: the BoM predates the array.

How, once a board exists. The PCA9634 has an 8-bit brightness register per channel (PWM0–PWM7, 97 kHz, no visible flicker). In a dark room, light one cell at a time at full and photograph the array with a phone at fixed exposure; read each cell's brightness from the image (a few lines of Python over the grey values), or use a lux meter at a fixed distance; scale every channel down to match the dimmest; store the eight factors as constants and write them once in the driver's wake-up. The same measurement tells whether 220 Ω is the right value for the next board.

Depends on the PCA9634 driver (NW-Status/QUEUE.md, "Okapi LED work, ordered", item 6) and a built board.

🤖 Generated with Claude Code

https://claude.ai/code/session_01BazaY6meA6yMRDeuUsv1Wd

主要言語
C++
スター
1
フォーク
0
PR マージ指標
30日以内にマージされた PR はありません

環境構築

はじめの一歩

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  2. 着手することを issue にコメントします — 二人が同じ作業をするのを防げます。
  3. リポジトリをフォークし、ブランチを切って変更します。
  4. issue 番号を参照したプルリクエストを送ります。

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