libFilter add-ons

Following my last post on my minimalist filter library, I just got off my butt to add some high-pass filtering capabilities too. That’s specially useful when you’re trying to remove trends from datasets – this happens a lot for instance in biomedical applications, e.g. ECG, where some breathing artifacts come up as low frequency trends … Read more

Minimalist low-pass filter library

So, the other day I needed to compute some low-pass filters on the fly on an Arduino Mega. By “on the fly” I mean that the filters’ parameters would eventually be recomputed mid-operation, so setting some equation with static const parameters would not cut it. Using a static filter, is, however, the most common application scenario. If … Read more

Finding my way with Cura 10.06

I’ve been using Cura as my go-to 3D-printer slicer for quite some time now. Compared to Slic3r, it’s faster and produces more optimized G-Code (using the same settings in both slicers, Cura’s prints were faster for me- but as always, YMMV). However, Cura provides less tweakable options than Slic3r, so it takes some getting used to. … Read more

PCL library with Kinect under OSX 10.11

This last week, I dug up my trustworthy Kinect for a spin. I’ve been wanting to mess around with the PCL (Point Clouds) library for some time, so I decided to give it a shot. Installation on OSX using Homebrew is fairly straigthforward, as shown in their documentation. However, I want to make sure that I … Read more

Using CMake and Qt Creator 5.5.1

Well, things have been dead around here. So, to keep things running, I’ve decided to post some less important content, mostly as notes-to-self (ya know, when you spend the weekend trying to get something to work, only to forget how you did it a month later). To avoid purging hard earned pseudo-knowledge, I’ll try to create the habit … Read more

Biohand: first short video

I submitted my biohand project as an entry to the 2015 Hackaday Prize. Cool. So, after spending a long month in a [21st-century] cave while writing my thesis (about the biohand), I discovered on August 16th that I needed to post a descriptive video of my entry until August 17th. Today. So yea, biohand‘s main … Read more

Biohand boards, fresh from the boardhouse

This page has been gathering some dust now, but this will change in the next weeks. I’ve been working on a new project, the biohand. It’s a low-cost 3D-printed hand prosthesis, that aims at offering technical qualities similar to multi-thousand dollar devices. More details shall come in another post. For now, I’m just willing to … Read more

Using Marlin’s auto leveling for PCB milling

As I’ve stated earlier, I designed my 3D Printer with light milling operations in mind. One of the activities I intended to tackle was the subtle art of  PCB milling. It seems pretty straightforward at first: get a new/raw PCB (printed circuit board), use something like FlatCAM to generate G-Code from your Gerber files, get yourself … Read more

Chronicles of my 3D printer, part 2: the electrical Pandora’s Box

Having finished the mechanical assembly of my printer, it was time to assemble the electronics to get everything moving. As I stated in the previous post, my intention to build a large-volume printer/mill made me choose NEMA 23 stepper motors for the X and Y axis. Larger motors would be capable of handling greater forces and more … Read more