Analog-to-digital percussions

tl;dr: jump to the end for a video where I hit a thing that sounds like other things.¬† Percussions are as cool as they are broadly defined. Hit a thing once – that’s noise. Hit it again rhytmically – that’s percussion.¬† The constraint is, you need an it to hit: a drum, cymbal, triangle, tambourine, … Read more

Curvatio: spinal curvature assesment at MuSMe2021

I recently had the opportunity to present at the 3rd day of the 2021 Symposium on Multibody Systems and Mechatronics (MuSMe2021). I talked briefly about Curvatio, a project developed a while back together with Biorob Tecnologias Assistivas and UFSC (Federal University of Santa Catarina), with the goal of offering low-cost, reliable assesment of spinal/postural curvature. … Read more

Multiband distortion with a touch of DIY

Spoiler: skip to the end for a video where all this makes (some) sense. As a wannabe metalhead-guitarist/bassist, I was long curious about how to get a certain gnarly bass tone, that pops up again and again in modern metal & djent. Recently, watching one of Rabea Massad’s videos, I seem to have stumbled on … Read more

Making your e-drums neighbor-friendly(ish)

Drums are¬†awesome¬†instruments. I mean, you hit stuff with wooden rods and dope sound comes out. It’s the pinnacle of human engineering.¬† They are, however, quite noisy, which makes them unsuitable for urban living spaces that cram more people per square-meter than Bangladesh. Luckily, electronic drumkits are a thing, and even more luckily, they don’t sound … Read more

Type-safe scripting with C++ (and other weird explorations)

The why and the what(-the-f***) Let’s start this short tale with some background.¬† For reasons unclear, I’ve started working on my n-th abandonable side-project. Much detail isn’t necessary here: it’s basically a C++ library for performing simple math operations— averaging, sum, standard deviation, autocorrelation and the like. Each operation is implemented as Functor: instantiate it, … Read more

Bare-metal? Unit-tests? Why not!

Ok, so I’ll try to keep this brief.¬† Some context Unit testing is a good thing, and you should be doing it (don’t worry: that was just me talking to myself, since I miserably fail to follow my own advice). “Well, why?”, you might ask. Simply put, it’s a nice way of ensuring that your … Read more

The VFD Series – Part 1: The ups and downs of SPWM

I’ve given up on trying to post periodically here. Let’s see if this brave act of reverse psychology has some effect on my productivity. Introduction Recently, I’ve started working on firmware for a three-phase frequency inverter. While this is absolutely no technological revolution on the grand scheme of things, it’s certainly new ground for me … Read more

AS5030 magnetic encoder: capturing a PWM signal with an ATSAMD21

It seems that I can’t avoid periodically ostracizing this page. Welp, let’s try to make it up. Context: the AS5030 magnetic encoder IC In a project I’m currently working on (more about it in later posts, perhaps), I needed a halfway decent way of measuring the angular displacement of a small, manually-turnt wheel. I had … Read more

Getting OpenProject up and running

Ok, so I was looking for a self-hosted project management tool. Something that would fill the gap that the late (and discontinued?) DotProject left in my heart. After lots of Googlin’, I came across OpenProject. Though they offer hosting plans, you can host the tool for free on your own server. Installation looked like it … Read more

openVPS: Poor man’s motion capture

The Why and The What Flying tiny drones indoors is cool, no questions asked. And stuff gets all the more interesting¬†when you can accurately control the drone’s position in space — enabling all sort of crazy manouvers. However, using regular GPS for such applications is often a no-go: antennas may be too heavy for the … Read more