https://project-blog-4dw.pages.dev/ Build logs for electronics, 3D printing, and other hobby projects. en Mon, 15 Jun 2026 07:00:00 +0000 https://project-blog-4dw.pages.dev/posts/2026-06-15-bookfinity-hardware-library.html https://project-blog-4dw.pages.dev/posts/2026-06-15-bookfinity-hardware-library.html Mon, 15 Jun 2026 07:00:00 +0000 My Biltema assortment boxes are discontinued, so I can't extend them — and a storage system you can't extend isn't really a system. The fix is to print my own: Gridfinity bins for the parts, held inside Bookfinity "books" that stand on a shelf. I restyled a comment-variant book cover into a nuts-and-bolts theme by feeding it to nanobanana, then printed it on my Bambu Lab P2S — print-in-place hinge and all. Two books done (Nuts & Bolts and Passive Components), no bins printed yet. https://project-blog-4dw.pages.dev/posts/2026-06-13-first-pcb-garden-valve.html https://project-blog-4dw.pages.dev/posts/2026-06-13-first-pcb-garden-valve.html Sat, 13 Jun 2026 20:30:00 +0000 Turning the four-transistor garden-valve circuit into my first home-made PCB. I drew it up in EasyEDA and kept everything through-hole so I can hand solder it. Claude caught two mistakes before I ordered — a switch trace tied to the supply rail instead of ground, and a missing flyback diode across the inductive motor — and then five boards went off to PCBWay. Designed and ordered, not yet soldered. https://project-blog-4dw.pages.dev/posts/2026-06-12-motorizing-the-summer-house-valve.html https://project-blog-4dw.pages.dev/posts/2026-06-12-motorizing-the-summer-house-valve.html Fri, 12 Jun 2026 23:35:00 +0000 Replacing a manual shutoff buried in the workshop floor at my family's summer house with a CWX-15Q motorised ball valve (CR05 control scheme), driven from a single switch by a four-transistor circuit that cuts power at the valve's limit switches. Tested on a breadboard, not yet installed. https://project-blog-4dw.pages.dev/posts/2026-06-12-hello-world.html https://project-blog-4dw.pages.dev/posts/2026-06-12-hello-world.html Fri, 12 Jun 2026 21:00:00 +0000 Why this site exists, how it works, and what it's built with: plain HTML committed to git, graph paper drawn in CSS, and a deploy pipeline that is just git push.