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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Wall LED Control</title>
<style>
:root {
--bg: #f4f4f6; --card: #ffffff; --text: #1b1b1f; --muted: #6b6b75;
--border: #dedee4; --accent: #4f6bed; --on: #2fa66a; --off: #c94848;
}
@media (prefers-color-scheme: dark) {
:root { --bg: #131316; --card: #1e1e23; --text: #ececf1; --muted: #9a9aa6;
--border: #34343c; --accent: #7d93ff; --on: #43c483; --off: #e06666; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
font: 15px/1.4 system-ui, "Segoe UI", sans-serif; }
main { max-width: 560px; margin: 0 auto; padding: 20px 16px 40px; display: grid; gap: 14px; }
h1 { font-size: 20px; margin: 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px; display: grid; gap: 12px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.label { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
button { font: inherit; border: 1px solid var(--border); background: var(--card); color: var(--text);
border-radius: 10px; padding: 9px 14px; cursor: pointer; user-select: none; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.on { background: var(--on); border-color: var(--on); color: #fff; }
button.off { background: var(--off); border-color: var(--off); color: #fff; }
button.sel { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); font-weight: 600; }
button:disabled { opacity: .45; cursor: default; }
.big { flex: 1; padding: 14px; font-size: 16px; font-weight: 600; }
#status { font-size: 14px; color: var(--muted); }
#status.ok { color: var(--on); }
input[type=range] { flex: 1; accent-color: var(--accent); }
input[type=color] { width: 64px; height: 44px; border: none; background: none; padding: 0; cursor: pointer; }
.swatches { display: grid; grid-template-columns: repeat(8, 1fr); gap: 8px; }
.swatch { aspect-ratio: 1; border-radius: 50%; padding: 0; border: 2px solid var(--border); }
.presets { display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 8px; }
.val { min-width: 42px; text-align: right; font-variant-numeric: tabular-nums; }
select, input[type=number] { font: inherit; padding: 8px; border-radius: 10px; border: 1px solid var(--border);
background: var(--card); color: var(--text); }
input[type=number] { width: 80px; }
.disabled { opacity: .5; pointer-events: none; }
.note { font-size: 13px; color: var(--muted); margin: 0; }
.slider-row .label { min-width: 104px; }
.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 6px; }
.palettes { display: grid; grid-template-columns: repeat(auto-fill, minmax(76px, 1fr)); gap: 8px; }
.pal { padding: 6px; display: grid; gap: 4px; font-size: 13px; }
.pal .bar { height: 10px; border-radius: 5px; }
.stage { display: grid; grid-template-columns: 96px 1fr; gap: 14px; align-items: center; }
#preview { width: 96px; height: 96px; border-radius: 16px; background: #000; border: 1px solid var(--border);
transition: box-shadow .05s; }
.readout { display: grid; gap: 8px; }
#bpm { font-size: 28px; font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1; }
#bpm small { font-size: 13px; font-weight: 400; color: var(--muted); }
#scene { font-size: 13px; color: var(--muted); min-height: 18px; }
.dots { display: flex; gap: 8px; }
.dot { width: 14px; height: 14px; border-radius: 50%; background: var(--border); }
.dot.lit { background: var(--accent); }
.dot.lit.down { background: var(--off); }
#energy { height: 6px; border-radius: 3px; background: var(--border); overflow: hidden; }
#energy div { height: 100%; width: 0; background: var(--accent); }
.dj { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.dj button { padding: 16px 8px; font-weight: 700; letter-spacing: .05em; }
.dj button.active { background: var(--text); color: var(--bg); }
.dj kbd { display: block; font: 11px ui-monospace, monospace; opacity: .6; font-weight: 400; margin-top: 2px; }
label.check { display: flex; gap: 8px; align-items: center; font-size: 14px; cursor: pointer; }
label.check input { accent-color: var(--accent); width: 16px; height: 16px; }
.chip { width: 44px; height: 44px; border-radius: 10px; background: #000; border: 1px solid var(--border); flex: none; }
#strips { display: grid; gap: 8px; }
#strips:empty { display: none; }
.strip { display: grid; grid-template-columns: 1fr auto auto auto; gap: 6px; align-items: center; }
.strip button { padding: 6px 12px; }
.strip .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.strip .name small { display: block; color: var(--muted); font-size: 12px; }
.strip.dim .name { opacity: .55; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { display: inline-flex; }
.tag button:first-child { border-radius: 10px 0 0 10px; }
.tag button.x { border-radius: 0 10px 10px 0; border-left: none; padding: 9px 10px; color: var(--muted); }
input[type=text], input[type=time] { font: inherit; padding: 8px; border-radius: 10px; border: 1px solid var(--border);
background: var(--card); color: var(--text); }
input[type=text] { flex: 1; min-width: 120px; }
.days { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.days button { padding: 7px 0; font-size: 13px; }
#schedules { display: grid; gap: 8px; }
#schedules:empty { display: none; }
.sched { display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: center; }
.sched .when { font-size: 18px; font-weight: 600; font-variant-numeric: tabular-nums; }
.sched small { display: block; color: var(--muted); font-size: 12px; }
.sched.dim .when, .sched.dim div { opacity: .5; }
</style>
</head>
<body>
<main>
<div class="row" style="justify-content:space-between">
<h1>Wall LED</h1>
<span id="status">Not connected</span>
</div>
<div class="card">
<div class="row">
<button id="connect" class="primary big">Connect</button>
</div>
<div id="strips"></div>
<p class="note" id="hint">Close the LED LAMP app on your phone first: the strip accepts only one connection at a time. Use Chrome or Edge. No strip? <a href="?demo">Try the demo</a>.</p>
</div>
<div id="controls" class="disabled" style="display:grid;gap:14px">
<div class="card">
<div class="row">
<button id="pon" class="on big">On</button>
<button id="poff" class="off big">Off</button>
</div>
</div>
<div class="card">
<div class="label">Music</div>
<div class="seg" id="source">
<button data-v="mic" class="sel">🎤 Microphone</button>
<button data-v="pc">🔊 Computer sound</button>
</div>
<div class="row">
<button id="micBtn" class="primary big">Start the show</button>
</div>
<div class="stage">
<div id="preview"></div>
<div class="readout">
<div id="bpm">--- <small>BPM</small></div>
<div class="dots"><span class="dot"></span><span class="dot"></span><span class="dot"></span><span class="dot"></span></div>
<div id="energy"><div></div></div>
<div id="scene">Not listening</div>
</div>
</div>
<div class="label">Mode</div>
<div class="seg" id="modes">
<button data-v="show" class="sel">Show</button>
<button data-v="strobe">Strobe</button>
<button data-v="pulse">Pulse</button>
<button data-v="spectrum">Spectrum</button>
</div>
<div class="label">Colors</div>
<div class="palettes" id="palettes"></div>
<div class="row slider-row">
<span class="label">Sensitivity</span>
<input type="range" id="sens" min="30" max="300" value="100">
<span class="val" id="sensVal">100%</span>
</div>
<div class="row slider-row">
<span class="label">Flash length</span>
<input type="range" id="flash" min="0" max="100" value="35">
<span class="val" id="flashVal">35%</span>
</div>
<div class="row slider-row">
<span class="label">Ambient glow</span>
<input type="range" id="glow" min="0" max="40" value="0">
<span class="val" id="glowVal">0%</span>
</div>
<div class="row slider-row">
<span class="label">Delay fix</span>
<input type="range" id="lead" min="0" max="250" value="90" step="10">
<span class="val" id="leadVal">90 ms</span>
</div>
<div class="row">
<label class="check"><input type="checkbox" id="lock" checked> Lock to tempo</label>
<label class="check"><input type="checkbox" id="accent" checked> White hit on beat 1</label>
<label class="check"><input type="checkbox" id="autoDrop" checked> Auto drop</label>
</div>
<div class="label">DJ</div>
<div class="dj">
<button id="djStrobe">STROBE<kbd>hold Space</kbd></button>
<button id="djBlack">BLACKOUT<kbd>hold B</kbd></button>
<button id="djDrop">DROP!<kbd>D</kbd></button>
</div>
<p class="note">Computer sound: when Edge asks what to share, pick <b>Entire screen</b> and turn on <b>Share system audio</b>. Keys: 1–7 colors, M next mode. Picking a color, preset or effect below stops the show.</p>
</div>
<div class="card" id="screenCard">
<div class="label">Screen sync</div>
<div class="row">
<div id="screenPreview" class="chip"></div>
<button id="screenBtn" class="primary big">Sync with the screen</button>
</div>
<div class="seg" id="screenMode">
<button data-v="vivid" class="sel">Vivid</button>
<button data-v="average">Average</button>
</div>
<div class="row slider-row">
<span class="label">Smoothing</span>
<input type="range" id="smooth" min="0" max="95" value="60">
<span class="val" id="smoothVal">60%</span>
</div>
<p class="note" id="screenNote">The strip follows the colors on your screen, like an ambient light behind a TV or monitor. Pick the screen or window to follow; it keeps going while this tab is in the background.</p>
</div>
<div class="card">
<div class="label">Color</div>
<div class="row">
<input type="color" id="color" value="#ffffff">
<span id="hex" class="val" style="text-align:left">#FFFFFF</span>
</div>
<div class="swatches" id="swatches"></div>
</div>
<div class="card">
<div class="label">Brightness</div>
<div class="row">
<input type="range" id="bright" min="1" max="100" value="100">
<span class="val" id="brightVal">100%</span>
</div>
</div>
<div class="card">
<div class="label">Presets</div>
<div class="presets" id="presets"></div>
</div>
<div class="card">
<div class="label">Scenes</div>
<div class="tags" id="scenes"></div>
<div class="row">
<input type="text" id="sceneName" placeholder="Name, e.g. Sofa evening" maxlength="24">
<button id="sceneSave">Save current</button>
</div>
<p class="note">A scene keeps the current color, brightness and effect, so you can bring it back with one tap or schedule it.</p>
</div>
<div class="card">
<div class="label">Built-in effects</div>
<div class="presets" id="effects"></div>
<div class="row">
<button id="effPrev">◀</button>
<input type="number" id="effNum" min="1" max="210" value="1">
<button id="effNext">▶</button>
<button id="effStop">Stop effect</button>
</div>
<p class="note">The controller has 210 built-in effects. Step through them with ◀ ▶.</p>
</div>
</div>
<div class="card">
<div class="label">Schedules</div>
<div id="schedules"></div>
<div class="row">
<input type="time" id="schAt" value="07:00" required>
<select id="schAction">
<option value="scene">Scene</option>
<option value="wake">Wake-up fade to</option>
<option value="off">Turn off</option>
</select>
<select id="schScene"></select>
<span id="schMinWrap" class="row" style="gap:6px"><span>over</span><input type="number" id="schMin" min="1" max="60" value="20"><span>min</span></span>
</div>
<div class="days" id="schDays"></div>
<div class="row"><button id="schAdd" class="primary">Add schedule</button></div>
<p class="note" id="schNote">Schedules run while this page is open, even in a background tab, and a strip is connected. A wake-up fade starts that many minutes early and reaches full brightness at the time you set.</p>
</div>
</main>
<!-- Tempo detector from BeatSense (https://github.com/heditrigui/beatsense, docs/tempo.js),
MIT License, Copyright (c) 2026 The BeatSense contributors. Copied in so this page stays one file. -->
<script data-test>
/*
* Real-time tempo detection, a JavaScript port of the Android app's TempoDetector.kt.
*
* 1. Spectral flux: every hop, an FFT frame is compared with the previous one and the
* increases in (log) energy across all frequencies are summed. Drum hits and note
* attacks make this "onset strength" spike.
* 2. Autocorrelation of the last `windowSeconds` of onset strength reveals how often the
* spikes repeat. Harmonics (2x and 3x the period) are added so the true beat wins over
* sub-divisions, and a gentle preference around 120 BPM settles half/double ambiguity.
* 3. The beat phase is found by sliding a comb at the detected period over the onsets,
* so the UI can pulse in time with the music.
*
* Works in browsers (window.BeatSense) and in Node (require) for the tests.
*/
(function (root) {
'use strict';
const MIN_BPM = 50;
const MAX_BPM = 220;
/** In-place radix-2 complex FFT of a fixed power-of-two size. */
class Fft {
constructor(n) {
if (n < 2 || (n & (n - 1)) !== 0) throw new Error('FFT size must be a power of two');
this.n = n;
this.cos = new Float64Array(n / 2);
this.sin = new Float64Array(n / 2);
for (let i = 0; i < n / 2; i++) {
this.cos[i] = Math.cos((2 * Math.PI * i) / n);
this.sin[i] = Math.sin((2 * Math.PI * i) / n);
}
const bits = Math.log2(n);
this.reversed = new Uint32Array(n);
for (let i = 0; i < n; i++) {
let r = 0;
for (let b = 0; b < bits; b++) r = (r << 1) | ((i >> b) & 1);
this.reversed[i] = r;
}
}
transform(re, im) {
const n = this.n;
for (let i = 0; i < n; i++) {
const j = this.reversed[i];
if (j > i) {
let t = re[i]; re[i] = re[j]; re[j] = t;
t = im[i]; im[i] = im[j]; im[j] = t;
}
}
for (let size = 2; size <= n; size *= 2) {
const half = size / 2;
const step = n / size;
for (let start = 0; start < n; start += size) {
let k = 0;
for (let j = start; j < start + half; j++) {
const c = this.cos[k];
const s = this.sin[k];
const tr = re[j + half] * c + im[j + half] * s;
const ti = im[j + half] * c - re[j + half] * s;
re[j + half] = re[j] - tr;
im[j + half] = im[j] - ti;
re[j] += tr;
im[j] += ti;
k += step;
}
}
}
}
}
class TempoDetector {
constructor(inputRate, windowSeconds = 12) {
this.decimation = inputRate >= 32000 ? 2 : 1;
this.rate = inputRate / this.decimation;
this.frameSize = 1024;
this.hop = 128;
this.framesPerSecond = this.rate / this.hop;
this.fft = new Fft(this.frameSize);
this.window = new Float64Array(this.frameSize);
for (let i = 0; i < this.frameSize; i++) {
this.window[i] = 0.5 - 0.5 * Math.cos((2 * Math.PI * i) / (this.frameSize - 1));
}
this.re = new Float64Array(this.frameSize);
this.im = new Float64Array(this.frameSize);
this.prevSpectrum = new Float64Array(this.frameSize / 2);
this.circular = new Float32Array(this.frameSize);
this.envCapacity = Math.floor(windowSeconds * this.framesPerSecond);
this.envelope = new Float64Array(this.envCapacity);
this.reset();
}
reset() {
this.writePos = 0;
this.filled = 0;
this.sinceHop = 0;
this.decimAcc = 0;
this.decimCount = 0;
this.envWrite = 0;
this.envCount = 0;
this.havePrev = false;
/** Loudness of the latest frame, 0..1 (rough, for a level meter). */
this.level = 0;
this.prevSpectrum.fill(0);
}
/** Feed mono samples in [-1, 1] as they arrive. */
feed(samples) {
for (let i = 0; i < samples.length; i++) {
const s = samples[i];
if (this.decimation === 2) {
this.decimAcc += s;
if (++this.decimCount < 2) continue;
this._push(this.decimAcc / 2);
this.decimAcc = 0;
this.decimCount = 0;
} else {
this._push(s);
}
}
}
_push(sample) {
this.circular[this.writePos] = sample;
this.writePos = (this.writePos + 1) % this.frameSize;
if (this.filled < this.frameSize) this.filled++;
if (++this.sinceHop >= this.hop && this.filled === this.frameSize) {
this.sinceHop = 0;
this._analyseFrame();
}
}
_analyseFrame() {
const n = this.frameSize;
const re = this.re;
const im = this.im;
let energy = 0;
for (let i = 0; i < n; i++) {
const s = this.circular[(this.writePos + i) % n];
energy += s * s;
re[i] = s * this.window[i];
im[i] = 0;
}
this.level = Math.min(1, Math.sqrt(energy / n) * 4);
this.fft.transform(re, im);
let flux = 0;
for (let k = 1; k < n / 2; k++) {
const mag = Math.log(1 + 100 * Math.hypot(re[k], im[k]));
if (this.havePrev) flux += Math.max(0, mag - this.prevSpectrum[k]);
this.prevSpectrum[k] = mag;
}
this.havePrev = true;
this.envelope[this.envWrite] = flux;
this.envWrite = (this.envWrite + 1) % this.envCapacity;
if (this.envCount < this.envCapacity) this.envCount++;
}
/** Onset strength over the analysis window, oldest first. */
envelopeSnapshot() {
const out = new Float64Array(this.envCount);
const start = (this.envWrite - this.envCount + this.envCapacity) % this.envCapacity;
for (let i = 0; i < this.envCount; i++) out[i] = this.envelope[(start + i) % this.envCapacity];
return out;
}
/**
* Current tempo, folded into [rangeLow, rangeHigh): rhythm is ambiguous by octaves (a 128 BPM
* house track also "pulses" at 64), so the caller picks the musical range it expects.
*/
estimate(rangeLow = 80, rangeHigh = 160) {
const fps = this.framesPerSecond;
const n = this.envCount;
if (n < fps * 4) return null;
const raw = this.envelopeSnapshot();
// Remove the slowly varying loudness so only the spikes remain.
const half = Math.floor(fps * 0.2);
const prefix = new Float64Array(n + 1);
for (let i = 0; i < n; i++) prefix[i + 1] = prefix[i] + raw[i];
const d = new Float64Array(n);
for (let t = 0; t < n; t++) {
const a = Math.max(0, t - half);
const b = Math.min(n, t + half + 1);
d[t] = Math.max(0, raw[t] - (prefix[b] - prefix[a]) / (b - a));
}
const minLag = Math.max(2, Math.floor((60 * fps) / MAX_BPM));
const maxLag = Math.floor((60 * fps) / MIN_BPM) + 1;
if (maxLag >= Math.floor(n / 2)) return null;
const acfLen = Math.min(n - 1, 3 * maxLag + 2);
const acf = new Float64Array(acfLen + 1);
for (let lag = 0; lag <= acfLen; lag++) {
let s = 0;
for (let t = 0; t < n - lag; t++) s += d[t] * d[t + lag];
acf[lag] = s / (n - lag);
}
if (acf[0] < 1e-9) return null;
const acfAt = (x) => {
const i = Math.floor(x);
if (i < 0 || i + 1 > acfLen) return 0;
const f = x - i;
return acf[i] * (1 - f) + acf[i + 1] * f;
};
const score = (lag) => {
const bpm = (60 * fps) / lag;
const octaves = Math.log(bpm / 120) / Math.log(2);
const prior = Math.exp(-0.5 * octaves * octaves);
return (acfAt(lag) + 0.5 * acfAt(2 * lag) + 0.25 * acfAt(3 * lag)) * prior;
};
// 1) Strongest periodicity on whole lags.
let bestLag = minLag;
let bestScore = -1;
for (let lag = minLag; lag <= maxLag; lag++) {
const s = score(lag);
if (s > bestScore) { bestScore = s; bestLag = lag; }
}
const rawBpm = (60 * fps) / bestLag;
// 2) Fold into the requested range, then polish the period on a fine fractional grid.
const folded = TempoDetector.fold(rawBpm, rangeLow, rangeHigh);
const centre = (60 * fps) / folded;
let lag = centre;
let lagScore = -1;
for (let x = centre - 1.2; x <= centre + 1.2; x += 0.01) {
const s = acfAt(x) + 0.5 * acfAt(2 * x);
if (s > lagScore) { lagScore = s; lag = x; }
}
const bpm = (60 * fps) / lag;
// Confidence: how far the beat peak stands above the average periodicity, gated by
// loudness so hum, tones and room noise don't look like a groove.
let mean = 0;
for (let i = minLag; i <= maxLag; i++) mean += acf[i];
mean /= maxLag - minLag + 1;
const contrast = (Math.max(acfAt(lag), acfAt(2 * lag)) - mean) / acf[0];
let rawMean = 0;
for (let i = 0; i < n; i++) rawMean += raw[i];
rawMean /= n;
const loudness = Math.min(1, Math.max(0, (rawMean - 5) / 15));
const confidence = Math.min(1, Math.max(0, contrast * 1.6)) * loudness;
// 3) Beat phase: where a comb with this period lines up best with the most recent onsets.
let bestPhase = 0;
let bestPhaseScore = -1;
const recent = Math.min(n, Math.floor(fps * 6));
for (let phase = 0; phase < Math.floor(lag); phase++) {
let s = 0;
for (let pos = n - 1 - phase; pos >= n - recent; pos -= lag) {
const i = Math.floor(pos);
s += d[i] + 0.5 * (i > 0 ? d[i - 1] : 0) + 0.5 * (i < n - 1 ? d[i + 1] : 0);
}
if (s > bestPhaseScore) { bestPhaseScore = s; bestPhase = phase; }
}
return { bpm, confidence, periodSec: lag / fps, lastBeatAgoSec: bestPhase / fps };
}
/** Brings a tempo into [low, high) by doubling or halving, e.g. 64 -> 128 for a dance range. */
static fold(bpm, low, high) {
let b = bpm;
while (b < low) b *= 2;
while (b >= high) b /= 2;
return b;
}
}
const api = { Fft, TempoDetector };
if (typeof module !== 'undefined' && module.exports) module.exports = api;
else root.BeatSense = api;
})(typeof window !== 'undefined' ? window : globalThis);
</script>
<script data-test>
// Beat clock for the music show, locked to the tempo detector: the detector's period and last
// beat set the clock, and later estimates nudge its phase so small errors don't jump.
class BeatClock {
constructor() { this.locked = false; this.period = 0.5; this.next = 0; this.lastBeat = -9; this.misses = 0; this.outliers = 0; }
/** est: TempoDetector.estimate() made with audio up to time now (seconds). */
update(est, now) {
// Lock on a clear beat; once locked, hold on through weaker stretches.
if (!est || est.confidence < (this.locked ? 0.08 : 0.15)) {
if (++this.misses > 4) this.locked = false;
return;
}
this.misses = 0;
// A beat time according to the detector. Its onsets show up ~22 ms after the attack
// (half an analysis frame), so move them back.
const grid = now - est.lastBeatAgoSec - 0.022;
if (!this.locked || Math.abs(est.periodSec - this.period) > this.period * 0.04) {
this.period = est.periodSec;
this.next = grid + Math.ceil((now - grid) / this.period - 0.25) * this.period;
this.locked = true;
return;
}
this.period += (est.periodSec - this.period) * 0.3;
// Phase error in beats, -0.5..0.5. Small errors are eased out. A big one is often the
// detector briefly hearing the off-beat, so the clock only jumps if it persists.
let off = (grid - this.next) / this.period;
off -= Math.round(off);
if (Math.abs(off) < 0.15) { this.next += off * this.period * 0.5; this.outliers = 0; }
else if (++this.outliers >= 3) { this.next += off * this.period; this.outliers = 0; }
}
/** True once per beat, lead seconds before it, so light and sound land together. */
tick(now, lead) {
if (!this.locked) return false;
while (this.next < now - this.period) this.next += this.period;
if (now < this.next - lead || this.next - this.lastBeat < this.period * 0.5) return false;
this.lastBeat = this.next;
this.next += this.period;
return true;
}
get bpm() { return this.locked ? 60 / this.period : 0; }
}
// Screen sync: one color for the strip from a small RGBA thumbnail of the screen. "average" is
// the plain mean. "vivid" takes the hue mostly from saturated, bright pixels, so a dark scene
// with a red sign glows red rather than brown, and the brightness from the whole picture.
function screenColor(px, mode) {
let r = 0, g = 0, b = 0, w = 0, lum = 0;
for (let i = 0; i < px.length; i += 4) {
const R = px[i], G = px[i + 1], B = px[i + 2];
const max = Math.max(R, G, B), min = Math.min(R, G, B);
lum += max;
const k = mode === 'vivid' ? ((max - min) / 255) ** 2 * (max / 255) + 0.002 : 1;
r += R * k; g += G * k; b += B * k; w += k;
}
let c = [r / w, g / w, b / w];
if (mode === 'vivid') {
const peak = Math.max(...c, 1);
c = c.map(x => x * (lum / (px.length / 4)) / peak);
}
return c.map(x => Math.round(Math.min(255, x)));
}
// Schedules: { id, at: 'HH:MM', days: [0-6, Sunday = 0], action: 'scene' | 'wake' | 'off',
// scene: { name, color: '#rrggbb', bright, effect }, minutes, on }. A wake-up fade starts
// `minutes` before `at` and reaches the scene's brightness at `at`. The Android app's
// Schedules.kt computes the same times.
/** Next time (ms) after `from` (ms) that the schedule starts, or null if it has no days. */
function nextFire(sch, from) {
const [h, m] = sch.at.split(':').map(Number);
const lead = sch.action === 'wake' ? sch.minutes * 60000 : 0;
for (let d = 0; d <= 8; d++) {
const t = new Date(from);
t.setDate(t.getDate() + d);
t.setHours(h, m, 0, 0);
if (sch.days.includes(t.getDay()) && t.getTime() - lead > from) return t.getTime() - lead;
}
return null;
}
/** Brightness t ms into a fade of total ms up to target: eased in, so it looks even to the eye. */
function fadeLevel(t, total, target) {
return Math.max(1, Math.round(target * Math.min(1, Math.max(0, t / total)) ** 2));
}
</script>
<script>
// LEDDMX-xx controller (LED LAMP app). Service ffe0, characteristic ffe1, 9-byte frames.
// Verified on LEDDMX-03-CC00: power on/off, color, brightness, effects.
const SERVICE = 0xffe0, CHAR = 0xffe1;
const frame = (...b) => new Uint8Array(b);
const CMD = {
on: () => frame(0x7b, 0x00, 0x04, 0x01, 0x00, 0x00, 0xff, 0x00, 0xbf),
off: () => frame(0x7b, 0x00, 0x04, 0x00, 0x00, 0x00, 0xff, 0x00, 0xbf),
color: (r, g, b) => frame(0x7b, 0xff, 0x07, r, g, b, 0x00, 0xff, 0xbf),
bright: (p) => frame(0x7b, 0xff, 0x01, Math.floor(p * 32 / 100), p, 0x00, 0xff, 0xff, 0xbf),
effect: (i) => frame(0x7b, 0xff, 0x03, i, 0xff, 0xff, 0xff, 0xff, 0xbf),
};
const $ = (id) => document.getElementById(id);
const hex = (bytes) => [...bytes].map(b => b.toString(16).padStart(2, '0')).join('');
// Inside the Android app there is no Web Bluetooth: provide the small part of it this page
// uses, backed by the app's native bridge (window.AndroidBle). Each requestDevice() makes a new
// link that the app connects to the next LEDDMX strip it finds that isn't connected yet.
if (window.AndroidBle && !navigator.bluetooth) {
const links = {};
let n = 0;
window.__ble = {
onStatus(key, state, detail) {
const l = links[key];
if (!l) return;
const p = l.pendingConnect;
if (state === 'connected') { l.device.name = detail; l.pendingConnect = null; p?.resolve(l.server); }
else if (state === 'failed') { l.pendingConnect = null; p?.reject(new Error(detail)); $('hint').textContent = detail; }
else if (state === 'disconnected') l.onDisconnect.forEach(fn => fn());
},
};
const newDevice = () => {
const key = 'p' + (++n);
const l = links[key] = { onDisconnect: [], pendingConnect: null };
const characteristic = { writeValueWithoutResponse: async (bytes) => AndroidBle.write(key, hex(bytes)) };
l.server = { getPrimaryService: async () => ({ getCharacteristic: async () => characteristic }) };
l.device = {
id: key, name: 'LEDDMX',
addEventListener: (type, fn) => { if (type === 'gattserverdisconnected') l.onDisconnect.push(fn); },
gatt: {
connect: () => new Promise((resolve, reject) => { l.pendingConnect = { resolve, reject }; AndroidBle.connect(key); }),
disconnect: () => AndroidBle.disconnect(key),
},
};
return l.device;
};
Object.defineProperty(navigator, 'bluetooth', { value: { requestDevice: async () => newDevice() } });
addEventListener('DOMContentLoaded', () => {
$('hint').textContent = 'Close the LED LAMP app first: a strip accepts only one connection at a time. Tap Add a strip again to connect more strips.';
$('source').querySelector('[data-v=pc]').remove();
$('palettes').closest('.card').querySelector('.note').textContent =
'Picking a color, preset or effect below stops the show. The screen stays on while the show runs.';
});
}
// Every connected strip gets every command, so several strips stay in sync. A strip switched
// off on its own row is left out until it is switched on again.
// Per strip, one write at a time; while a write is in flight, keep only the latest pending frame
// per kind so dragging a slider doesn't build up a backlog.
const strips = [];
function send(kind, bytes) {
for (const s of strips) if (!s.off || kind === 'power') sendTo(s, kind, bytes);
}
function sendTo(s, kind, bytes) {
s.pending.set(kind, bytes);
pump(s);
}
async function pump(s) {
if (s.busy || !s.ch) return;
s.busy = true;
try {
while (s.pending.size && s.ch) {
const [kind, bytes] = s.pending.entries().next().value;
s.pending.delete(kind);
try { await s.ch.writeValueWithoutResponse(bytes); }
catch (e) { console.warn('write failed', s.name, e); }
await new Promise(r => setTimeout(r, 40));
}
} finally { s.busy = false; }
}
function setStripPower(s, on) {
s.off = !on;
sendTo(s, 'power', on ? CMD.on() : CMD.off());
renderStrips();
}
function renderStrips() {
const ready = strips.filter(s => s.ch).length;
$('status').textContent = demo ? 'Demo mode: no strip'
: ready ? `${ready} strip${ready > 1 ? 's' : ''} connected`
: strips.length ? 'Connecting…' : 'Not connected';
$('status').className = ready ? 'ok' : '';
$('controls').classList.toggle('disabled', !ready);
$('connect').textContent = demo ? 'Leave demo' : strips.length ? 'Add a strip' : 'Connect';
$('strips').replaceChildren(...strips.map((s) => {
const row = document.createElement('div');
row.className = 'strip' + (s.off || !s.ch ? ' dim' : '');
row.innerHTML = '<div class="name"></div><button class="on">On</button><button class="off">Off</button><button title="Disconnect">✕</button>';
row.querySelector('.name').textContent = s.name;
const small = document.createElement('small');
small.textContent = s.state + (s.ch && s.off ? ', switched off' : '');
row.querySelector('.name').append(small);
const [on, off, remove] = row.querySelectorAll('button');
on.onclick = () => setStripPower(s, true);
off.onclick = () => setStripPower(s, false);
on.disabled = off.disabled = !s.ch;
remove.onclick = () => removeStrip(s);
return row;
}));
}
function setStatus(text) { $('hint').textContent = text; }
async function connectGatt(s) {
s.state = 'Connecting…'; renderStrips();
for (let attempt = 1; attempt <= 3 && s.wantConnected; attempt++) {
try {
const server = await s.device.gatt.connect();
const svc = await server.getPrimaryService(SERVICE);
s.ch = await svc.getCharacteristic(CHAR);
s.name = s.device.name || s.name;
s.state = 'Connected';
renderStrips();
pump(s);
return true;
} catch (e) {
console.warn('connect attempt', attempt, e);
await new Promise(r => setTimeout(r, 800));
}
}
s.state = 'Could not connect. Is the phone app closed?';
renderStrips();
return false;
}
function removeStrip(s) {
s.wantConnected = false;
if (strips.includes(s)) strips.splice(strips.indexOf(s), 1);
if (s.ch) s.device.gatt.disconnect();
s.ch = null;
renderStrips();
}
// Demo mode (?demo): every control works and the music show runs, but nothing is sent anywhere.
const demo = new URLSearchParams(location.search).has('demo');
const fakeStrip = (name) => ({ name, state: 'Demo', ch: { writeValueWithoutResponse: async () => {} }, pending: new Map(), off: false });
if (demo) {
strips.push(fakeStrip('Demo strip 1'), fakeStrip('Demo strip 2'));
addEventListener('DOMContentLoaded', () => {
renderStrips();
$('hint').textContent = 'Nothing is sent to a strip in demo mode. The colour square in the Music card shows what the strips would do.';
});
}
$('connect').onclick = async () => {
if (demo) {
location.search = '';
return;
}
if (!navigator.bluetooth) {
setStatus('Web Bluetooth not available. Open this page in Chrome or Edge.');
return;
}
let device;
try {
device = await navigator.bluetooth.requestDevice({
filters: [{ namePrefix: 'LEDDMX' }, { services: [SERVICE] }],
optionalServices: [SERVICE],
});
} catch (e) {
if (e.name !== 'NotFoundError') setStatus('Error: ' + e.message);
return;
}
if (strips.some(s => s.device === device || s.device?.id === device.id)) {
setStatus(device.name + ' is already connected.');
return;
}
const s = { device, name: device.name || 'LEDDMX', state: '', ch: null, pending: new Map(), busy: false, off: false, wantConnected: true };
strips.push(s);
device.addEventListener('gattserverdisconnected', () => {
s.ch = null;
s.state = 'Disconnected';
renderStrips();
if (s.wantConnected) setTimeout(() => connectGatt(s), 1000);
});
if (!await connectGatt(s)) {
if (s.wantConnected) setStatus('Could not connect to ' + s.name + '. Is the phone app closed?');
removeStrip(s);
} else if (strips.some(o => o !== s && o.ch)) {
// A strip added next to others joins in their state: on, same color and brightness.
sendTo(s, 'power', CMD.on());
if (!music) sendTo(s, 'color', CMD.color(...hexToRgb($('color').value)));
sendTo(s, 'bright', CMD.bright(+$('bright').value));
}
};
// Power: all strips
function powerAll(on) {
if (on) strips.forEach(s => { s.off = false; });
send('power', on ? CMD.on() : CMD.off());
renderStrips();
}
$('pon').onclick = () => powerAll(true);
$('poff').onclick = () => powerAll(false);
// Color
function hexToRgb(h) { const n = parseInt(h.slice(1), 16); return [n >> 16, (n >> 8) & 255, n & 255]; }
function setColor(hex) {
stopShows();
currentEffect = 0;
$('color').value = hex;
$('hex').textContent = hex.toUpperCase();
send('color', CMD.color(...hexToRgb(hex)));
}
$('color').oninput = (e) => setColor(e.target.value);
const SWATCHES = ['#ff0000', '#ff4000', '#ffb000', '#00ff00', '#00ffd0', '#0000ff', '#8000ff', '#ff00a0',
'#ffffff', '#ffd9a0', '#ff8c40', '#ff2060', '#40a0ff', '#a0ff40', '#6000ff', '#ff60ff'];
for (const c of SWATCHES) {
const b = document.createElement('button');
b.className = 'swatch'; b.style.background = c; b.title = c;
b.onclick = () => setColor(c);
$('swatches').append(b);
}
// Brightness
function setBright(p) {
$('bright').value = p;
$('brightVal').textContent = p + '%';
send('bright', CMD.bright(p));
}
$('bright').oninput = (e) => { stopWake(); setBright(+e.target.value); };
// Presets: color + brightness
const PRESETS = [
['Bright white', '#ffffff', 100], ['Warm white', '#ffb060', 80], ['Reading', '#ffd9a0', 100],
['Movie', '#3020ff', 15], ['Night', '#ff3000', 5], ['Focus', '#a0d0ff', 90],
['Sunset', '#ff5010', 60], ['Party pink', '#ff00a0', 100], ['Ocean', '#00a0ff', 70],
];
for (const [name, hex, br] of PRESETS) {
const b = document.createElement('button');
b.textContent = name;
b.onclick = () => applyScene({ name, color: hex, bright: br, effect: 0 });
$('presets').append(b);
}
// Effects
let currentEffect = 0; // 0 while showing a plain color
function setEffect(i) {
stopShows();
i = Math.max(1, Math.min(210, i));
currentEffect = i;
$('effNum').value = i;
send('effect', CMD.effect(i));
}
const EFFECTS = [['Effect 1', 1], ['Effect 2', 2], ['Effect 3', 3], ['Effect 10', 10],
['Effect 25', 25], ['Effect 50', 50]];
for (const [name, i] of EFFECTS) {
const b = document.createElement('button');
b.textContent = name;
b.onclick = () => setEffect(i);
$('effects').append(b);
}
$('effPrev').onclick = () => setEffect(+$('effNum').value - 1);
$('effNext').onclick = () => setEffect(+$('effNum').value + 1);
$('effNum').onchange = () => setEffect(+$('effNum').value);
$('effStop').onclick = () => setColor($('color').value);
// ---------------------------------------------------------------------------
// Music show: analyse microphone or computer sound and stream colors to the strip.
// The tick is driven by an audio processing callback rather than a timer, so it keeps
// running at full rate when this tab is in the background.
const PALETTES = {
Neon: ['#ff00a0', '#00e5ff', '#8000ff', '#ff2bd6', '#00ff9c'],
Fire: ['#ff2000', '#ff6a00', '#ffb000', '#ff0030'],
Ocean: ['#0030ff', '#00b0ff', '#00ffd0', '#5000ff'],
Jungle: ['#00ff40', '#a0ff00', '#00ffa0', '#ffd000'],
Police: ['#ff0000', '#0020ff'],
Rainbow: ['#ff0000', '#ff8000', '#ffff00', '#00ff00', '#00a0ff', '#4000ff', '#c000ff'],
Mine: null, // the color picker's color
};
const opts = { source: 'mic', mode: 'show', palette: 'Neon' };
const paletteRgb = () => (PALETTES[opts.palette] || [$('color').value]).map(hexToRgb);
function segmented(id, key) {
const btns = [...$(id).children];
const pick = (v) => { opts[key] = v; btns.forEach(b => b.classList.toggle('sel', b.dataset.v === v)); };
btns.forEach(b => b.onclick = () => pick(b.dataset.v));
return pick;
}
const pickSource = segmented('source', 'source');
const pickMode = segmented('modes', 'mode');
const palButtons = Object.keys(PALETTES).map((name) => {
const b = document.createElement('button');
b.className = 'pal' + (name === opts.palette ? ' sel' : '');
b.dataset.v = name;
const cols = PALETTES[name];
const grad = cols ? `linear-gradient(90deg, ${cols.join(', ')})` : 'var(--pick, #fff)';
b.innerHTML = `<div class="bar" style="background:${grad}"></div>${name}`;
b.onclick = () => pickPalette(name);
$('palettes').append(b);
return b;
});
function pickPalette(name) {
opts.palette = name;
palButtons.forEach(b => b.classList.toggle('sel', b.dataset.v === name));
}
const syncPick = () => $('palettes').style.setProperty('--pick', $('color').value);
$('color').addEventListener('input', syncPick); syncPick();
for (const [id, unit] of [['sens', '%'], ['flash', '%'], ['glow', '%'], ['lead', ' ms'], ['smooth', '%']]) {
const show = () => { $(id + 'Val').textContent = $(id).value + unit; };
$(id).addEventListener('input', show); show();
}
// Manual DJ controls, read by the show on every tick.
const dj = { strobe: false, black: false, dropAt: -1 };
function holdButton(id, key) {
const el = $(id);
const set = (v) => { dj[key] = v; el.classList.toggle('active', v); };
el.addEventListener('pointerdown', () => set(true));
['pointerup', 'pointerleave', 'pointercancel'].forEach(t => el.addEventListener(t, () => set(false)));
return set;
}
const setStrobe = holdButton('djStrobe', 'strobe');
const setBlack = holdButton('djBlack', 'black');
$('djDrop').onclick = () => { dj.dropAt = 0; };
const MODES = ['show', 'strobe', 'pulse', 'spectrum'];
addEventListener('keydown', (e) => {
if (!music || e.target.matches('input[type=number], select')) return;
if (e.code === 'Space') { e.preventDefault(); if (!e.repeat) setStrobe(true); }
else if (e.code === 'KeyB') setBlack(true);
else if (e.code === 'KeyD' && !e.repeat) dj.dropAt = 0;
else if (e.code === 'KeyM') pickMode(MODES[(MODES.indexOf(opts.mode) + 1) % MODES.length]);
else if (/^Digit[1-7]$/.test(e.code)) pickPalette(Object.keys(PALETTES)[+e.code.slice(5) - 1]);
});
addEventListener('keyup', (e) => {
if (e.code === 'Space') setStrobe(false);
if (e.code === 'KeyB') setBlack(false);
});
let music = null;
const clamp = (x, a = 0, b = 1) => Math.max(a, Math.min(b, x));
const scale = (rgb, k) => rgb.map(c => Math.round(c * clamp(k)));
const mix = (a, b, t) => a.map((c, i) => Math.round(c + (b[i] - c) * t));
const WHITE = [255, 255, 255], BLACK = [0, 0, 0];
async function getAudio() {
const audio = { echoCancellation: false, noiseSuppression: false, autoGainControl: false };
if (opts.source === 'mic') return navigator.mediaDevices.getUserMedia({ audio });
const stream = await navigator.mediaDevices.getDisplayMedia({ video: true, audio, systemAudio: 'include' });
stream.getVideoTracks().forEach(t => { t.enabled = false; });
if (!stream.getAudioTracks().length) {
stream.getTracks().forEach(t => t.stop());
throw new Error('No sound was shared. Pick "Entire screen" and turn on "Share system audio".');
}
return stream;
}
async function startMusic() {
stopScreen(); stopWake();