ITOHI — Open-Source Hardware, Embedded Systems & DIY Builds

For years my drones travelled with me. A DJI Air first, then a Mini 3 — camera platforms that rode along on every trip, packed next to the rest of the gear. They were good at exactly one thing: hovering somewhere legal and taking a clean photo. That was the problem. Hovering at the permitted altitude, framing a …

The Pavo20 Pro II is a capable 2.5" whoop — compact, powerful, with a good camera and a surprisingly solid video link even on linear whip antennas. I wanted it as a mountain trip quad: something that fits in a jacket pocket, dives canyons, and has GPS Rescue as a genuine safety net. GPS is not included; I added a …

After successfully reverse engineering the CR30 colorimeter, I found myself wanting something more versatile - a device that could not only measure reflected light but also handle transmittance measurements with fiber optic coupling. The result is this compact, portable visible light spectrometer built around a …

So here I am, a physicist who got bitten by the color science bug. What started as innocent curiosity about how light works has turned into a full-blown obsession with spectrometers, colorimeters, and now... laser power meters. You know how it goes - you start with one simple question and before you know it, you're …

One day my DS420+ just died. Well, not completely dead - it powered on, fans spun up, disks spun up too, blue LED blinked... but that was it. No network, no beeps, nothing. Just an expensive paperweight with my data trapped inside. Initial Diagnostics First thing I tried was removing all the drives. Sometimes a bad …

In the previous post I mentioned wanting to build a DIY color chart that could serve as a reference for Darktable's color calibration module. That article teased this as "a topic for another time." This is that time. The idea is simple in theory: print a set of known color patches, measure each one with the CR30, and …

I've always been fascinated by the intersection of hardware and software, especially when it comes to understanding how devices communicate. Recently, I developed a need for monitor calibration as well as properly color correct my photos. I've been looking at X-Rite, Datacolor and other calibration devices and am on …

My obsession with audio reproduction started with my first i386 PC. Back then, getting any sound out of a computer required creativity. I experimented with the internal PC speaker, directly accessing the timer IC to generate crude audio through clever PWM modulation. The results were terrible, but fascinating. Next …

I've been involved in Full Stack for a while now in one form or another(either maintaining, designing or working on Full Stack projects). Even during school time, I was building websites for myself and my friends. I've built sites commercially even. Although I've been using either pure HTML+JS or even PHP/Perl at some …

I was building a Christmas set of spherical speakers just to familiarize myself with ADAU1401 Sigma DSP. And I wanted to add Bluetooth capability to the speakers so that they could receive sound data from an old Samsung Galaxy Note 10.1 in the kitchen. Granted, I have ordered some Bluetooth audio receivers, however, …