mertlresearch @mertlresearch@mastodon.social

Screenprinting solder paste, placing the SMD components and reflow soldering using my DIY setup. The outcome is very satisfying.

#ruwai #diy #solder #openhardware #seismic

Finished two Ruwai Power Supply 2 shields. I'm happy that everything worked as expected.
#Ruwai #diy #seismic

Starting to reactivate my small DIY seismic hardware pool. I have started soldering some PCBs that have been kept on hold during the last year to finalize and upgrade some of my open hardware seismic data recorders called Ruwai.

I'm currently switching from GNUcash to a plaintext accounting software. I'm using beancount, beancount-mode for emacs and the fava frontend. Right now I'm experimenting and learning how to use the beancount features using my last years data. It's looking promising and I can't wait to use the python API of beancount to create custom reports.

https://plaintextaccounting.org/
https://github.com/beancount/beancount

#erp #emacs #beancount #plaintextaccounting

Starting the year making up a workflow for self-printed photo zines. Just got the first test run of a set of printed sheets. I'm using FOSS software only for device calibration, layout and impositioning. Only the printer software is proprietary. Unfortunately high quality printing under Linux is not yet possible with free software.

Emacs org-mode, orgparse, Jinja2 and Latex are my tools of choice to implement an intuitive text-based ERP system for my small company. Feeding data from org files to Latex templates using orgparse and the Jinja template system is working great.

https://orgmode.org/
https://pypi.org/project/orgparse/
https://palletsprojects.com/p/jinja/

#emacs #orgmode #erp

My Jekyll Homepage https://www.mertl-research.at/ is available in two languages. I have written a Jekyll Plugin which allows the handling of multiple languages. I have tried the jekyll-multiple-languages-plugin first, but it contained too many monkey patches and changes of core classes. So I have written a custom plugin that uses Jekyll Hooks only.
There is no documentation yet, but you can take a look at the code on Github.

https://github.com/stefanmaar/jekyll-multilang

#jekyll #jekyllrb

Quite exceptional seismicity happening right now in the Vienna Basin area. Just followed an earthquake almost live on our interactive map at https://www.macroseismicsensor.at/. Didn't feel this one in Vienna though. But the one, that happend the last night woke me up.

#earthquake #mss #seismology

After one night of computation, the output of the dense reconstruction is looking good. The next step will be to resample to a uniform sampling distance the get rid of the "shadow" effects.

#skate #diy #sfm #mvs

After a revisit of the spot to collect images to fill some gaps, the sparse reconstruction is looking good.

#skateboard #diy #sfm #mvs

The Viennese high fog has settled, so uniform light is guaranteed. I took this opportunity to take photos from St.Marx DIY, which has grown quite a lot this year. Just started the structure from motion workflow. Let's see if I have captured all important details, or if I have to revisit the site to fill in some gaps.

#skateboard #diy #sfm

Skate hardware is getting rare. No more Spitfire wheels available over here. Hope to avoid flatspots for some time.

Migrated my Jekyll site to the Foundation 6 Framework using the new XY-Grid. No problems, it was a pleasure. Integrated a Vue/Vuex app using leaflet also worked fine.

Visit https://www.mertl-research.at/mss-nrt-map/ for live visualization of the seismicity in the Vienna Basin.

#jekyll #foundation6 #seismic #seismicity #macroseismic #mss

Everyone is streaming...I'm in. I have created m-aar Radio at https://www.mertl-research.at/maar_radio/ which currently streams the sonification of seismic data recorded on a Greenland glacier. 184 days from May to October 2012 resulting in 21 hours and 28 minutes of streaming audio. Tune in and drift into the great white nothing.....

It's great to have control over the output in 5 ns increments. Beaglebone Black PRU and assembly is fun.

Output pulse with 105 ns and 110 ns length triggered by a GPS PPS signal (yellow line).

#beagleboneblack #pru #ruwai #openhardware

Working on a GPS disciplined clock signal for using BeagleBone Black PRUs in my home-office. I'm currently testing the timing performance. The fastest time to set an output GPIO high in response to an input GPS PPS signal is ca. 35 ns using Assembly code.
I didn't code in Assembly for ages, but working directly with all the hardware registers and knowing what every clock cycle does is somehow beautiful.

#ruwai #beagleboneblack #pru #assembly

The earthquake today at 05:24 UTC with an epicenter near #Zagreb and a magnitude of ML = 5.4 (ZAMG) has been detected by the MSS network in the Vienna Basin and marked as an event which might have been felt in a wide area.
The aftershock at 06:01 UTC with a magnitude ML = 4.9 (ZAMG) has been detected as well.

Visit https://www.mertl-research.at/mss-nrt-map/ to get near real-time information about the seismicity in the southern Vienna Basin.

#earthquake #mss #opendata #geoscience

Preparing for the next days. I'm going to redesign my seismic datarecorder Ruwai using the BeagleBone Black PRUs.

https://www.mertl-research.at/projects/ruwai/

#openhardware #seismic #seismograph #beagleboneblack