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README.md
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FastLED on PC

What?

With this software you can run an Arduino Sketch on your PC. In particular, you can run FastLED sketches with Adafruit-GFX.

It is made for Linux using SDL.

Hello World!

Why?

It takes three weeks to ship a serial LED strip from China, but I want to start coding animations now!

HowTo

If you are using Arduino Make, it should be sufficient to replace the Arduino.mk include with makeNativeArduino.mk in your Makefile. Then simply run make as usual.

See the example/ directory for an example.

This uses a patched version of FastLED which outputs to a SDL buffer instead of real hardware.

To use it, replace your usual FastLED.addLeds<WS2812B, DATA_PIN>(leds, num_leds); with

FastLED.addLeds<SDL, width, height>(leds, num_leds);

The Layout for NeoMatrix is NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS (no ZIGZAG as you would want on real hardware)

If things appear too dark, use the + key to increase brightness.

Installation

SDL is used to render a simulation of the LED-Strip Matrix. To install the required dependencies, run

sudo apt install libsdl2-dev

The project uses git submodules to include the Arduino libraries. To get them, you have to run

git submodule init
git submodule update

after checking out the repository.

About

A simple simulator for FastLED/Adafruit-GFX Sketches based on SDL

Topics

adafruit-gfxarduinofastledsdl2simulator

Resources

Readme
Activity

Stars

9 stars

Watchers

1 watching

Forks

2 forks
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Repository files navigation
FastLED on PC
What?
With this software you can run an Arduino Sketch on your PC.
In particular, you can run FastLED sketches with Adafruit-GFX.
It is made for Linux using SDL.
Hello World!
Why?
It takes three weeks to ship a serial LED strip from China, but I want to start coding animations now!
HowTo
If you are using Arduino Make, it should be sufficient to
replace the Arduino.mk include with makeNativeArduino.mk in your Makefile.
Then simply run make as usual.
See the example/ directory for an example.
This uses a patched version of FastLED which outputs to a SDL buffer instead of real hardware.
To use it, replace your usual FastLED.addLeds<WS2812B, DATA_PIN>(leds, num_leds); with
FastLED.addLeds<SDL, width, height>(leds, num_leds);

The Layout for NeoMatrix is NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS (no ZIGZAG as you would want on real hardware)
If things appear too dark, use the + key to increase brightness.
Installation
SDL is used to render a simulation of the LED-Strip Matrix.
To install the required dependencies, run
sudo apt install libsdl2-dev

The project uses git submodules to include the Arduino libraries. To get them, you have to run
git submodule init
git submodule update

after checking out the repository.
About
A simple simulator for FastLED/Adafruit-GFX Sketches based on SDL
Topics
adafruit-gfxarduinofastledsdl2simulator
Resources
Readme
Activity
Stars
9 stars
Watchers
1 watching
Forks
2 forks
Report repository
Releases
Packages
Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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README.md
makeNativeArduino.mk
makeNativeArduino.mk
Repository files navigation
FastLED on PC
What?
With this software you can run an Arduino Sketch on your PC.
In particular, you can run FastLED sketches with Adafruit-GFX.
It is made for Linux using SDL.
Hello World!
Why?
It takes three weeks to ship a serial LED strip from China, but I want to start coding animations now!
HowTo
If you are using Arduino Make, it should be sufficient to
replace the Arduino.mk include with makeNativeArduino.mk in your Makefile.
Then simply run make as usual.
See the example/ directory for an example.
This uses a patched version of FastLED which outputs to a SDL buffer instead of real hardware.
To use it, replace your usual FastLED.addLeds<WS2812B, DATA_PIN>(leds, num_leds); with
FastLED.addLeds<SDL, width, height>(leds, num_leds);

The Layout for NeoMatrix is NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS (no ZIGZAG as you would want on real hardware)
If things appear too dark, use the + key to increase brightness.
Installation
SDL is used to render a simulation of the LED-Strip Matrix.
To install the required dependencies, run
sudo apt install libsdl2-dev

The project uses git submodules to include the Arduino libraries. To get them, you have to run
git submodule init
git submodule update

after checking out the repository.
About
A simple simulator for FastLED/Adafruit-GFX Sketches based on SDL
Topics
adafruit-gfxarduinofastledsdl2simulator
Resources
Readme
Activity
Stars
9 stars
Watchers
1 watching
Forks
2 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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README.md
makeNativeArduino.mk
makeNativeArduino.mk
Repository files navigation
FastLED on PC
What?
With this software you can run an Arduino Sketch on your PC.
In particular, you can run FastLED sketches with Adafruit-GFX.
It is made for Linux using SDL.
Hello World!
Why?
It takes three weeks to ship a serial LED strip from China, but I want to start coding animations now!
HowTo
If you are using Arduino Make, it should be sufficient to
replace the Arduino.mk include with makeNativeArduino.mk in your Makefile.
Then simply run make as usual.
See the example/ directory for an example.
This uses a patched version of FastLED which outputs to a SDL buffer instead of real hardware.
To use it, replace your usual FastLED.addLeds<WS2812B, DATA_PIN>(leds, num_leds); with
FastLED.addLeds<SDL, width, height>(leds, num_leds);

The Layout for NeoMatrix is NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS (no ZIGZAG as you would want on real hardware)
If things appear too dark, use the + key to increase brightness.
Installation
SDL is used to render a simulation of the LED-Strip Matrix.
To install the required dependencies, run
sudo apt install libsdl2-dev

The project uses git submodules to include the Arduino libraries. To get them, you have to run
git submodule init
git submodule update

after checking out the repository.
About
A simple simulator for FastLED/Adafruit-GFX Sketches based on SDL
Topics
adafruit-gfxarduinofastledsdl2simulator
Resources
Readme
Activity
Stars
9 stars
Watchers
1 watching
Forks
2 forks
Report repository
Releases
Packages
Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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71 Commits
Folders and files
NameName
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example
example
libraries
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src
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.gitmodules
README.md
README.md
makeNativeArduino.mk
makeNativeArduino.mk
Repository files navigation
FastLED on PC
What?
With this software you can run an Arduino Sketch on your PC.
In particular, you can run FastLED sketches with Adafruit-GFX.
It is made for Linux using SDL.
Hello World!
Why?
It takes three weeks to ship a serial LED strip from China, but I want to start coding animations now!
HowTo
If you are using Arduino Make, it should be sufficient to
replace the Arduino.mk include with makeNativeArduino.mk in your Makefile.
Then simply run make as usual.
See the example/ directory for an example.
This uses a patched version of FastLED which outputs to a SDL buffer instead of real hardware.
To use it, replace your usual FastLED.addLeds<WS2812B, DATA_PIN>(leds, num_leds); with
FastLED.addLeds<SDL, width, height>(leds, num_leds);

The Layout for NeoMatrix is NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS (no ZIGZAG as you would want on real hardware)
If things appear too dark, use the + key to increase brightness.
Installation
SDL is used to render a simulation of the LED-Strip Matrix.
To install the required dependencies, run
sudo apt install libsdl2-dev

The project uses git submodules to include the Arduino libraries. To get them, you have to run
git submodule init
git submodule update

after checking out the repository.
About
A simple simulator for FastLED/Adafruit-GFX Sketches based on SDL
Topics
adafruit-gfxarduinofastledsdl2simulator
Resources
Readme
Activity
Stars
9 stars
Watchers
1 watching
Forks
2 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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.gitmodules
README.md
README.md
makeNativeArduino.mk
makeNativeArduino.mk
Repository files navigation
FastLED on PC
What?
With this software you can run an Arduino Sketch on your PC.
In particular, you can run FastLED sketches with Adafruit-GFX.
It is made for Linux using SDL.
Hello World!
Why?
It takes three weeks to ship a serial LED strip from China, but I want to start coding animations now!
HowTo
If you are using Arduino Make, it should be sufficient to
replace the Arduino.mk include with makeNativeArduino.mk in your Makefile.
Then simply run make as usual.
See the example/ directory for an example.
This uses a patched version of FastLED which outputs to a SDL buffer instead of real hardware.
To use it, replace your usual FastLED.addLeds<WS2812B, DATA_PIN>(leds, num_leds); with
FastLED.addLeds<SDL, width, height>(leds, num_leds);

The Layout for NeoMatrix is NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS (no ZIGZAG as you would want on real hardware)
If things appear too dark, use the + key to increase brightness.
Installation
SDL is used to render a simulation of the LED-Strip Matrix.
To install the required dependencies, run
sudo apt install libsdl2-dev

The project uses git submodules to include the Arduino libraries. To get them, you have to run
git submodule init
git submodule update

after checking out the repository.
About
A simple simulator for FastLED/Adafruit-GFX Sketches based on SDL
Topics
adafruit-gfxarduinofastledsdl2simulator
Resources
Readme
Activity
Stars
9 stars
Watchers
1 watching
Forks
2 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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src
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.gitmodules
README.md
README.md
makeNativeArduino.mk
makeNativeArduino.mk
Repository files navigation
FastLED on PC
What?
With this software you can run an Arduino Sketch on your PC.
In particular, you can run FastLED sketches with Adafruit-GFX.
It is made for Linux using SDL.
Hello World!
Why?
It takes three weeks to ship a serial LED strip from China, but I want to start coding animations now!
HowTo
If you are using Arduino Make, it should be sufficient to
replace the Arduino.mk include with makeNativeArduino.mk in your Makefile.
Then simply run make as usual.
See the example/ directory for an example.
This uses a patched version of FastLED which outputs to a SDL buffer instead of real hardware.
To use it, replace your usual FastLED.addLeds<WS2812B, DATA_PIN>(leds, num_leds); with
FastLED.addLeds<SDL, width, height>(leds, num_leds);

The Layout for NeoMatrix is NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS (no ZIGZAG as you would want on real hardware)
If things appear too dark, use the + key to increase brightness.
Installation
SDL is used to render a simulation of the LED-Strip Matrix.
To install the required dependencies, run
sudo apt install libsdl2-dev

The project uses git submodules to include the Arduino libraries. To get them, you have to run
git submodule init
git submodule update

after checking out the repository.
About
A simple simulator for FastLED/Adafruit-GFX Sketches based on SDL
Topics
adafruit-gfxarduinofastledsdl2simulator
Resources
Readme
Activity
Stars
9 stars
Watchers
1 watching
Forks
2 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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README.md
makeNativeArduino.mk
makeNativeArduino.mk
Repository files navigation
FastLED on PC
What?
With this software you can run an Arduino Sketch on your PC.
In particular, you can run FastLED sketches with Adafruit-GFX.
It is made for Linux using SDL.
Hello World!
Why?
It takes three weeks to ship a serial LED strip from China, but I want to start coding animations now!
HowTo
If you are using Arduino Make, it should be sufficient to
replace the Arduino.mk include with makeNativeArduino.mk in your Makefile.
Then simply run make as usual.
See the example/ directory for an example.
This uses a patched version of FastLED which outputs to a SDL buffer instead of real hardware.
To use it, replace your usual FastLED.addLeds<WS2812B, DATA_PIN>(leds, num_leds); with
FastLED.addLeds<SDL, width, height>(leds, num_leds);

The Layout for NeoMatrix is NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS (no ZIGZAG as you would want on real hardware)
If things appear too dark, use the + key to increase brightness.
Installation
SDL is used to render a simulation of the LED-Strip Matrix.
To install the required dependencies, run
sudo apt install libsdl2-dev

The project uses git submodules to include the Arduino libraries. To get them, you have to run
git submodule init
git submodule update

after checking out the repository.
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A simple simulator for FastLED/Adafruit-GFX Sketches based on SDL
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adafruit-gfxarduinofastledsdl2simulator
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