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NT札幌 2013/12/13: Addressable LED Stringで遊んでみる
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NT札幌 2013/12/13: Addressable LED Stringで遊んでみる
1.
Addressable LED String で遊んでみる 2013/12/13
NT札幌勉強会 @edy555
2.
ヒカリもの
3.
LED Stringとは • たくさんのLEDが一列につな がったもの
4.
Addressable LEDとは • 一つ一つのLEDを個別に制御 できるタイプ • Cons: コントローラが必要 • Pros:
コントローラ次第でなん でもできる
5.
どこで買える?
6.
種類が色々ある • 30pcs/m, 60pcs/m, 144pcs/m • 防水の有無 • チップはWS2811がおススメ
7.
8.
チップの仕組み • パッケージの中に、LEDと コントローラチップが統合 されている
9.
チップの仕組み • ごく弱く光らせた状態 • • 1%くらい 各色のLEDは、8ビット=256階 調でPWM制御
10.
軽く光らせてみる
11.
注意点 • 電源にパワーが必要 • 4m(240pcs)の定格は、5V 72W (=15A) • 実際に秋月のACアダプタを飛 ばしました • 弱く光らせるくらいなら電池 でも可能です
12.
つなぎ方 • 接続は+5V, GND, DINの3本のみ • • 8ピンマイコンでもOK DOUTが次のLEDのDINに接続されている
13.
プロトコル • ビットの表現はパルス幅 • 24bitでLED一つ分 • データをセットされたLEDは次 にデータをスルーで渡す • リセットパルスで復帰(50us) • データレートは800kHz • 240個のLEDの場合フレームレー トは8.5ms程度
14.
コントローラ • Arduinoの場合 • FastSPI library ! #define FORCE_SOFTWARE_SPI #define
FORCE_SOFTWARE_PINS #include "FastSPI_LED2.h" ! ! #define NUM_LEDS 240 #define DATA_PIN 6 CRGB leds[NUM_LEDS]; ! ! ! ! • void setup() { FastLED.addLeds<WS2811, DATA_PIN, RGB>(leds, NUM_LEDS); } ! void loop() { leds[0] = CRGB::White; FastLED.show(); } 他に Adafruit_NeoPixel library
15.
Musical String • デモとして作ってみた • 音楽に合わせて光が流れる • 強度→光の強さ • 周波数→色 • 処理:AD変換→FFT→ガンマ補正 • http://youtu.be/Rjqbege1r3Q
16.
Tree Shape String • 単純なシリアル信号なので、 分岐させることが可能 • ツリーっぽく配置してみた • http://youtu.be/khGmbNQPlZw
17.
見かけた応用例 • ゲーム(テトリス) • マトリクスディスプレイ • 間接照明 • シーリング照明 • littleBitsと繋ぐと面白いかも
18.
fin
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