feat: basic interfacing

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/webstorm+iml,node,macos,dotenv
+# Edit at https://www.toptal.com/developers/gitignore?templates=webstorm+iml,node,macos,dotenv
+
+### dotenv ###
+.env
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
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+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
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+# Coverage directory used by tools like istanbul
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+
+# nyc test coverage
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+.grunt
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+# Bower dependency directory (https://bower.io/)
+bower_components
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+# node-waf configuration
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+# Compiled binary addons (https://nodejs.org/api/addons.html)
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+# Dependency directories
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+
+# Snowpack dependency directory (https://snowpack.dev/)
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+# TypeScript cache
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+# Microbundle cache
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+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
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+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
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+
+# dotenv environment variable files
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
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+dist
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+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
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+.vuepress/dist
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+# vuepress v2.x temp and cache directory
+.temp
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+# yarn v2
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+
+### Node Patch ###
+# Serverless Webpack directories
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+
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+.svelte-kit
+
+### WebStorm+iml ###
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+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
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+# AWS User-specific
+.idea/**/aws.xml
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+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
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+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### WebStorm+iml Patch ###
+# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
+
+*.iml
+modules.xml
+.idea/misc.xml
+*.ipr
+
+# End of https://www.toptal.com/developers/gitignore/api/webstorm+iml,node,macos,dotenv

index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Web MIDI Example</title>
+</head>
+<body>
+<h1>Web MIDI Example</h1>
+<button id="connectBtn">Connect MIDI Device</button>
+
+<script src="main.js"></script>
+</body>
+</html>

main.js

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+let launchpads = [];
+
+const LED_VALUES = {
+    OFF: 12,
+    RED_LOW: 13,
+    RED: 15,
+    AMBER_LOW: 29,
+    AMBER: 63,
+    YELLOW: 62,
+    GREEN_LOW: 28,
+    GREEN: 60
+}
+
+document.addEventListener('DOMContentLoaded', () => {
+    // Check if Web MIDI is supported
+    if (navigator.requestMIDIAccess) {
+        // Prompt the user to connect a MIDI device
+        const connectBtn = document.getElementById('connectBtn');
+        connectBtn.addEventListener('click', connectMIDI);
+    } else {
+        console.log('Web MIDI is not supported in this browser.');
+    }
+
+    // navigator.permissions.query({ name: "midi", sysex: true }).then((result) => {
+    //     if (result.state === "granted") {
+    //         const connectBtn = document.getElementById('connectBtn');
+    //         connectBtn.addEventListener('click', connectMIDI);
+    //     } else if (result.state === "prompt") {
+    //         // Using API will prompt for permission
+    //     }
+    //     // Permission was denied by user prompt or permission policy
+    // });
+});
+
+function connectMIDI() {
+    navigator.requestMIDIAccess()
+        .then(onMIDISuccess)
+        .catch(onMIDIFailure);
+}
+
+function onMIDISuccess(midiAccess) {
+    const outputs = midiAccess.outputs.values();
+    for (let output of outputs) {
+        console.log(output)
+        if(output.name === 'Launchpad') {
+            launchpads.push(output);
+            //input.onmidimessage = onMIDIMessage;
+        }
+        let message = [0x90, 0, LED_VALUES.GREEN];
+        output.send(message);
+
+        message[1] = 1;
+        message[2] = LED_VALUES.AMBER;
+        output.send(message)
+
+        message[1] = 2;
+        message[2] = LED_VALUES.RED;
+        output.send(message)
+    }
+
+    console.log('MIDI connection established.');
+}
+
+function onMIDIFailure(error) {
+    console.error('MIDI connection failed:', error);
+}
+
+function onMIDIMessage(event) {
+    // Handle MIDI messages here
+    // For example:
+    console.log('MIDI Message:', event.data);
+}

package.json

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+{
+  "name": "web-midi-sequencer",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT"
+}