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

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

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.

plaintextaccounting.org/
github.com/beancount/beancount

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.

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

My Jekyll Homepage 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.

github.com/stefanmaar/jekyll-m

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

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.

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

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.

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

Reminder: Springer has released a lot of digital textbooks for free in the last few months, and their special offer is ending on July 31st. There is no need to sign up to download the PDF and ePub files.

This lovely page has the full list of available titles: hnarayanan.github.io/springer-

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

Everyone is streaming...I'm in. I have created m-aar Radio at 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).

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.

The earthquake today at 05:24 UTC with an epicenter near 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 mertl-research.at/mss-nrt-map/ to get near real-time information about the seismicity in the southern Vienna Basin.

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