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Site URL: jrainimo.com/build
Feed URL: jrainimo.com/build/feed
Posts: 10
Followers: 1
T9
https://jrainimo.com/build/2026/05/t9/?utm_source=rss&utm_medium=rss&utm_campaign=t9
Published: May 4, 2026 03:27
Forewarning: Bit of a plug for PCBWay in here, but they deserve it. They’re a rad company, and I always like working with them. Premise: This project is a reasonably straightforward keyboard / Bluetooth project, that touches a few neat features, without…
Jet
https://jrainimo.com/build/2026/01/jet/?utm_source=rss&utm_medium=rss&utm_campaign=jet
Published: January 11, 2026 15:41
As with most of my projects lately, I’m finding that I’m playing catch up with the documentation, so this is an old one. This project is a bit of a twofer, because it was the demo project for Stretch, my Kicad plugin. Did I say I have a backlog? Stretch…
Capacitive Scrollwheels in KiCad
Published: January 28, 2025 13:39
As of next week, KiCad 9 should be about to release.  One of the many exciting features, to me, is that it now includes a footprint generator that I contributed, for capacitive scrollwheels. It’s based on the Atmel (now Microchip) appnote AN294…
Open-Source Thermal Simulation of PCBs
Published: November 6, 2024 23:15
Simulation has always been the dream of PCB design. In most cases, it hasn’t been practical – Either in the domain of expensive or esoteric tools that are compute-cycle hungry and limited in scope. But we’re at a turning point. This is the process for…
1 Pound Combat Robot
Published: October 4, 2024 00:52
This post is about three years late, but I’m catching up.  Combat robots like Battlebots are seeing something of a revival right now. The ones on the Battlebots show are 250lbs, and cost tens of thousands of dollars – most of that in batteries. Much more…
Adding a hide button to Facebook Marketplace with Tampermonkey
Published: September 8, 2024 23:28
Tampermonkey, the successor to Greasemonkey, allows on-the-fly modifications to webpages. Things like adding buttons, or modifying text on a page.  Facebook Marketplace is fast becoming the only viable used item listing in my area. Which is annoying –…
Very Remote Control
Published: June 4, 2024 01:18
Instead of a TV at home, I use a projector. It’s on my ceiling, with the buttons inaccessible. The remote for it also isn’t really working anymore. Problem. There’s nothing on the remote control’s PCB except for an obscure microcontroller (TTR013), IR LED…
Key Storage
Published: February 21, 2024 23:50
I’m on a home improvement kick. When I walking my home, there’s a long, featureless hallway with kitchen at the end of it. I was using a tray on my kitchen counter to toss keys onto when I walked in the door. This takes up valuable kitchen counterspace,…
The Worst RC Car in the World
Published: November 3, 2023 22:41
Quite some time ago now, I wanted to make some of remote control car. And, also, eventually turn it into an autonomous sumobot or similar. This project was done a few years ago, but I’m writing it up now. In the interest of getting something into my hands…
Rock Planters Rock
Published: September 30, 2023 04:12
I’ve been wanting to play around with concrete for a while, as a project material. I’m not sure what the end goal will be, but once I’m familiar with the material, I’ll be able to shoehorn it into other projects in unexpected ways. Concrete (actually…