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Show HN: 16×16 LED Matrix Controlled via Web Bluetooth

https://github.com/dmachard/pixelart-16x16

2•dmachard•2h ago

Comments

dmachard•2h ago

Hi, I built this just for fun. Draw pixel art in a browser and see it instantly light up on a physical 16×16 LED matrix. No app to install, just open the web page and connect via Bluetooth.

Live demo: https://dmachard.github.io/pixelart-16x16/

Tech stack: - ESP32-C3 - WS2812B LED matrix (256 RGB LEDs) - Web Bluetooth API

All code + STL files on GitHub. Happy to answer questions!

Property-Based Testing in Practice

https://dl.acm.org/doi/pdf/10.1145/3597503.3639581

1•birdculture•1m ago•0 comments

FFmpeg: Revoke Social Media Delegation

https://lists.ffmpeg.org/archives/list/ffmpeg-devel@ffmpeg.org/thread/47X6GPFNL4P4YDI3EGISHIXWQ56...

1•ikeashark•2m ago•0 comments

Why Busy Beaver Hunters Fear the Antihydra

https://benbrubaker.com/why-busy-beaver-hunters-fear-the-antihydra/

1•Bogdanp•6m ago•0 comments

Burnout and Elon Musk's politics spark exodus from senior xAI, Tesla staff

https://arstechnica.com/cars/2025/09/burnout-and-elon-musks-politics-spark-exodus-from-senior-xai...

1•PaulHoule•8m ago•0 comments

Use No Memo

https://react.dev/reference/react-compiler/directives/use-no-memo

1•akatsutki•8m ago•0 comments

Bubble Talk Doesn't Disprove a Bubble – Streetwise

https://www.wsj.com/livecoverage/stock-market-today-dow-sp-500-nasdaq-10-27-2025/card/bubble-talk...

1•zerosizedweasle•8m ago•0 comments

Grounding LLMs with Symbolic Planning

https://theelderscripts.com/grounding-llms-in-the-logic-of-planning/

1•haarlemist•9m ago•0 comments

Beware Stories: Manufacturing Intent (2021)

https://osf.io/preprints/socarxiv/ym3s2_v1

1•Marshferm•11m ago•0 comments

BridgeBio aces phase 3 rare disease test, clearing path to FDA

https://www.fiercebiotech.com/biotech/bridgebio-aces-phase-3-rare-disease-test-clearing-path-fda

1•randycupertino•13m ago•1 comments

Life next to 199 data centres

https://www.bbc.com/news/articles/c93dnnxewdvo

1•easton•13m ago•0 comments

Tool that helps understand and work with OKLCH colors

https://oklch.fyi

1•jakubkrehel•14m ago•0 comments

Privatizing Law Enforcement: The Economics of Whistleblowing

https://marginalrevolution.com/marginalrevolution/2025/10/privatizing-law-enforcement-the-economi...

1•paulpauper•15m ago•0 comments

Jade

https://medium.com/@mkkca/jade-9fbc94bbf0a0

1•MKK•16m ago•0 comments

A Nuclear Fission Regulatory Blank Slate

https://austinvernon.site/blog/nuclearregulation.html

1•paulpauper•16m ago•0 comments

LaTeX, LLMs and Boring Technology

https://eli.thegreenplace.net/2025/latex-llms-and-boring-technology/

2•ibobev•16m ago•0 comments

AI's Trap: Settling for Boilerplate over Elegant Code

https://dayvster.com/blog/ais-trap-settling-for-boilerplate-over-elegant-code/

2•ibobev•17m ago•0 comments

Seed Oils, Early-Onset Cancer and Human Metabolic Variability

https://mindandmatter.substack.com/p/seed-oils-early-onset-cancer-and

1•paulpauper•17m ago•0 comments

Worse Is Better Start Simple and Iterate

https://dayvster.com/blog/worse-is-better-start-simple-and-iterate/

1•ibobev•17m ago•2 comments

PageIndex: Next Generation Vectorless, Reasoning-Based RAG

https://pageindex.ai/blog/pageindex-intro

1•vindex10•17m ago•0 comments

JetKVM Is Now Available for Retail Purchase

https://jetkvm.com/products

4•elashri•18m ago•0 comments

Calculating Satiety per Calorie: A Data-Driven Approach to Nutrition

https://optimisingnutrition.com/calculating-satiety-per-calorie/

1•rzk•19m ago•0 comments

Show HN: A new approach to voter guides (human and AI) – CA Prop 50 example

https://www.fairmind.org/guides/california-proposition-50-2025

1•quadtree•19m ago•0 comments

Ubuntu Unity in Need of More Developers to Survive

https://www.phoronix.com/news/Ubuntu-Unity-25.10-Troubles

1•speckx•19m ago•1 comments

The glaring security risks with AI browser agents

https://techcrunch.com/2025/10/25/the-glaring-security-risks-with-ai-browser-agents/

1•greg_V•21m ago•0 comments

Show HN: Relai-SDK – simulate → evaluate → optimize AI agents

https://github.com/relai-ai/relai-sdk

3•sfeizi•21m ago•0 comments

Back-end driven HTMZ development

https://github.com/jon49/htmz-be

3•nymanjon•22m ago•3 comments

We released an AI-powered browser extension

https://apps.apple.com/us/app/xofocus-ai-highlighter/id6747393021

1•kamronsaniee•23m ago•0 comments

Quarter of American employees haven't taken a vacation day in the past year

https://sherwood.news/personal-finance/almost-a-quarter-of-american-employees-havent-taken-a-sing...

1•avonmach•24m ago•0 comments

There is such a thing as 'settled science'

https://www.livescience.com/human-behavior/politics/there-is-such-a-thing-as-settled-science-anyo...

1•geox•25m ago•0 comments

Researchers create smallest pixel measuring just 300 nanometers across

https://www.tomshardware.com/monitors/researchers-create-worlds-smallest-pixel-measuring-just-300...

1•rbanffy•27m ago•0 comments