Sparse ramblings.
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
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
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
This last week, I dug up my trustworthy Kinect for a spin. I’ve been wanting to mess around with the PCLÂ (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
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
On August 28th I’ve presented my thesis on the biohand. The whole was recorded and edited; audio quality could be better, but it still does the trick. English subtitles available!
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
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
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
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