The new rules of context engineering for Claude 5 generation models

A shell colon does nothing. Use it anyway

JetZero

The UK MET office recently redesigned their site, adding a lot of additional whitespace, scrolling, and animations. This significantly reduced its usability for me, and left me wanting an ‘at a glance’ weather site.I made <a href="https:&#x2F;&#x2F;brolly.sh" rel="nofollow">https:&#x2F;&#x2F;brolly.sh</a>, a minimalist, plain text weather forecasting site. You can use it to view weather from around the world, with: 7 day forecast; Previous day log (so you can confirm it definitely was cooler &#x2F; hotter &#x2F; wetter &#x2F; drier yesterday!); Hourly rain, wind, temperature, conditions; Hourly UV, air quality and pollen, including pollen type specific forecasts within the EU &#x2F; UK; Location search and last 5 locations; Location specific units.I mostly made the site for myself, if anyone else also benefits from it that’s an added advantage.You can check out the weather in York, UK at <a href="https:&#x2F;&#x2F;brolly.sh&#x2F;forecast&#x2F;RWFP2qW8" rel="nofollow">https:&#x2F;&#x2F;brolly.sh&#x2F;forecast&#x2F;RWFP2qW8</a>, or search for a location at <a href="https:&#x2F;&#x2F;brolly.sh" rel="nofollow">https:&#x2F;&#x2F;brolly.sh</a>The site is deliberately styled as a single long scrollable column, to work on mobile phones. You can view it on desktop too, there&#x27;s just a lot of horizontal padding. I naturally took a lot of inspiration from plaintextsports.com. Despite not being a sports fan, I love its aesthetic. But, you&#x27;ll hopefully see that this site isn&#x27;t a rip off, and has its own deliberate look and feel.Visualisations are really important to showing information at a glance. I spent a lot of time designing the different visualisations and making them work with only characters. My favourite is the hourly heat map used for pollen count.It&#x27;s also frustrating to have an interactive site, where you can&#x27;t share a page with a friend and have them see what you&#x27;re seeing. To solve this, all page state (i.e. location, selected day, expanded &#x2F; collapsed sections), is stored in the URL. You can share or bookmark the specific view, and know that you&#x27;ll always be able to come back to it.The site uses PocketBase. It’s written in Go and plain HTML&#x2F;JavaScript&#x2F;CSS. All pages are backend rendered, with light JavaScript to handle re-loading content without page jumps when using interactive features like next &#x2F; previous day navigation. Weather forecasts are fetched from open-meteo.com, which has a very generous free tier. However, I also built a custom LRU cache on top of PocketBase’s SQLite DB to cache forecasts for 5 minutes, and avoid putting unnecessary pressure on the open-meteo API.

Show HN: Brolly, a plain-text weather forecast site

Running a 28.9M parameter LLM on an $8 microcontroller

Hi HN,
I made some animations of the most important kinds of transistors using my semiconductor simulation, details of which are on the page. I tried to make the visuals as realistic as possible while also aiming for clarity. If you want to go beyond the charge carriers and look at, for example, the electric field, you can do so in the simulation software. The desktop software also has less common devices like IBGTs and SCRs that have similar animations.The last thread about my software was posted here about a year ago: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=43942279">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=43942279</a>

Show HN: I made some transistor animations

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Inflect-Micro-v2: complete voice in 9.36M parameters

I got tired of Googling basic course info, so I made a free directory of every US courseGoogle filters for golf course results are terrible so I built a better way to browse courses using OSM as the backbone.... <a href="https:&#x2F;&#x2F;golfcoursebrowser.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;golfcoursebrowser.com&#x2F;</a>It&#x27;s a work in progress and mostly US for now, but I want to expand to the rest of North America, the EU, and the rest of the world ASAP.It&#x27;s free, no ads, no login, no bs. If you spot anything wrong (bad info, a missing course, wrong scorecard), you can flag it right on the course page. I actually read those and fix them.Still a lot of missing info, but I&#x27;m filling out more and more each day. The goal is the most complete, and current golf course directory in the world, verified and maintained by actual golfers. I think is attainable in the next few months.
The base layer is OpenStreetMap, cross-checked against course websites and enriched with scorecards, USGA rating&#x2F;slope, and public&#x2F;private status. User corrections from golfers who know their home course have beaten every commercial data source we check against.

HN

The new rules of context engineering for Claude 5 generation models

A shell colon does nothing. Use it anyway

JetZero

Show HN: Brolly, a plain-text weather forecast site

Running a 28.9M parameter LLM on an $8 microcontroller

Show HN: I made some transistor animations

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DeepSeek pause fundraise after comments on compute gap to US leaked (transcript) [pdf]

An ESP32 based plane radar for my desk

Inflect-Micro-v2: complete voice in 9.36M parameters

Show HN: I mapped every US golf course

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