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Sarah.Alroe.dk
A blog about various projects i've been doing.
Latest posts
MSc Completed
Finished Masters in IT-Product Development @ cs.au Continuing part B of my PhD @ ddinf
An overview of the NEXterminal NEXstation IX thin client
I’ve been wanting to play around with clustering, but just as a hobby, so on the cheap. What better strategy than a bunch of old discarded thin clients? I found a cheap Lithuanian eBay listing for a NEXterminal NEXstation IX thin client and took a bit of a gamble that it would be sufficient for low power computing. There doesn’t seem to be too much information about these things online, so let’s…
De-centering Inclusivity: Fitting Design for Aut-Ethnography
I got my first full paper accepted and presented it at CHI2025! Thanks to Alex for taking pictures. As the first product of my PhD, this paper explores how design can support autistic practices of autoethnography through an autoethnographic design process of a series of simple-as-can-be recording devices. Through this we propose three individual design fits, which must be accommodated to in a…
Temporal dithering of NeoPixels on an ATtiny412
So, I had the thought, wouldn’t it be neat to have a physical version of the neurodiversity rainbow infinity symbol ? Like a little animated thingy that could decorate your desk or maybe be worn as a badge. I couldn’t find anyone who had created such a thing yet, so I did it myself. If you want to build one, the board design, code, and extras are available on GitHub . If sourcing boards and…
Some approaches to processing PDM recordings on device
TLDR PDM Recordings tend to be very low volume and offset from zero. By looping through the sample twice, we can find minimum, maximum and average sample values, and then offset and scale to produce a normalized clip. If we have extra processing power (for floating calculations), we could also add a simple limiter/compressor. As the offset drifts wildly at first, we should begin sampling as early…
Fixing the deep sleep current consumption of the M5Stack Unit CamS3
TLDR The camera module fails to power down. Remove R5 and connect its camera-side pad to a free gpio, to allow software control of the cameras PWDN pin. Working on a battery powered camera prototype using the M5Stack CamS3, I got way shorter battery life than expected. A CamS3 Unit entering deep sleep directly after initial boot would draw less than a milliamp as expected. However, as soon as the…
My assertive rodent got turned into a paper?!
Years ago, as part of the CS.AU talent track program, I got to play with a haptic feedback authoring device called Feelix . I then immediately reprogrammed the device to function as a scroll-wheel with reactive force-feedback. Through resistance and bumpiness, scrolling could communicate hidden information of the underlying document: What if contested areas of a Wikipedia article were a bumpy…
Intimacy at a distance
For the second semester course of my masters Designing Wearables , I wanted to explore how wearable design could support people in showing care and affection when touch-aversion hinders close physical contact. I took an auto-ethnographic approach, centering the work in my own experiences of intimacy and touch-aversion in an autistic relationship. The result was the first NonHug prototype. Feeling…
PhD Started
Began 4+4 PhD @ cc.au Department of Digital Design & Information Studies .
Other things done in 2023
Update 04-08: Added section on a bangle.js app I had forgotten, fixed title. And now, a summary of some of the things I got up to in 2023 that I did not have the time to put on a blog. Course projects I spent the majority of my spring semester (20 ects worth) on the course Innovation Project . Here I worked with the Fællessteder project to explore how stewardship and community can be encouraged in…
SM58 Gas Mask
About a month ago, my partner suggested a new project: Let’s turn their found-in-an-abandoned-hospital second world war gas mask into a microphone… Sure! Their idea was pretty straight forward: Dissesamble a Sure SM58 microphone. Open and empty out the filter cartridge of the mask. Somehow install the SM58 internals inside the canister. Oh, and make sure whatever we do looks nice enough for live…
Other things done in 2022
I spent most of 2022 stuck to a computer, finishing up my bachelors and continuing my masters. Somehow I also found the time to move apartments. This years fall semester featured three courses, Social and Aesthetic Interaction Design (SAINT), Building the Internet of Things with P2P and Cloud Computing (P2P) and Interactivity and Computer Mediation - Concepts, Theories, Methods, Cases (ICM). The…
BCs Obtained
Finished Bachelor in IT-Product Development @ cs.au Began Masters in IT-Product Development @ cs.au
BitBug analog bitcrusher
So, the bitcrusher. You know, that classic digital effect used by everything from daft punk to artists that have had original ideas in their career? Those are pretty cool right? The whole adjusting intrinsic aspects of digital audio to give sounds a completely new character. What if we were to take this pretty simple effect and replicate it in the analog domain with great difficulty? That seems…
Landline Microphone adapter
So I bought an old landline phone. Partially because I wanted to play around with PBX systems, partially because I wanted to try building a carbon microphone for studio use. This is about the second idea. Premise First challenge: Carbon microphones (and because of that, landline phones) produce signals through variations in biased current. Carbon microphones are an incredibly simple form of…
Other things done in 2021
Last year I turned the ArduinoISP circuit into a PCB, which I etched on a single sided board. The design had a few practical issues, and etched PCBs always get kinda grimy over time, so I improved it and sent it off for professional production. The improved design features labelled status LEDs next to the socket (instead of in front), and a silkscreen displaying basic instructions for flashing a…
Endnu en kontorbygning som et samtidigt billede og konkretisering af et tab.
The zine can be downloaded as a regular pdf , or as a print-and-fold pdf .
A battery powered light globe
Some time ago, I found two glass globes for old lighting fixtures in a thrift shop. At the time I had plans to turn them into an IOT status indicator and an electronic scrying ball using addressable LEDs and capacitive sensing. Then the globes went on the shelf for a few months while I searched for time and energy. In the meantime I did the HexBlink project, and ended up having a few candle…
Adventures in low-budget tin casting pt. 2
Back in 2018, I had a go at making various metal badges , using only cheap, easily accessible materials (and I guess a 3D printer). The main issues at the time were getting a good pour, and getting the mould to release the initial positive. I have now attempted to find solutions to these issues while casting actual three dimensional figures. I will again note how the purpose of this project is…
HexBlink
Some months ago I came across a circuit simply consisting of a bunch of 1.5 hz blinking LEDs all wired in parallel. With the individual LEDs being individually clocked but partially synchronized, the pattern it creates is quite mesmerizing. I then ordered some LEDs and filled out a protoboard to test it out myself. The result is entirely meaningless, but very fancy. A rectangle of blinkenlights…
LM35Hg v1.0
As an exercise in electronics design and soldering, I had the idea of recreating the visual of a mercury or alcohol thermometer using smd components. The circuit features an LM35 temperature sensor amplified by an LM293 op-amp, 30 LEDs powered by 15 LM393 dual comparators LM293 dual op-amps comparing the op-amp output with the values of a voltage ladder made of discrete resistors. All resistors…