I have reactivated my LoRaWAN development system consisting of an IMST Lite Gateway with the ChirpStack Gateway-OS installed and an Arduino MKR WAN 1310. It's perfect for quick development and testing of LoRaWAN nodes for data acquistion.


I have added a short review of the M=2.4 earthquake last week recorded with the MSS network. The earthquake was most likely not felt within the region of the MSS network. The epicenter was slightly outside of the MSS network region. In the video on the review post you can see the seismic waves passing the network.


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.

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.

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.

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.

Working on building two of my open hardware design seismic dataloggers for a short-term deployment in Greenland. Besides building it, I also have to include some hard- and software improvements. Let's see if it works out...
So far, thanks to KiCad 5, the redesign of a power supply PCB has been a joy.

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