Blog

Behelfs-Mund-Nasen-Maske nähen

March 27, 2020
diy, sewing

Aktuell verbreitet sich das neuartige Coronavirus (SARS-CoV-2) rasant auf der gesamten Welt mit teils verheerenden Folgen. Dies soll aber kein Beitrag über das Virus an sich sein, sondern eine Anleitung wie ihr euch auch in Zeiten, in denen Mundschutz Mangelware ist und besser dem medizinischen Personal vorbehalten werden sollte, ganz einfach selber eine Behelfslösung nähen könnt.

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VFD Tube Experiments

February 10, 2020
electronics, vfd, arduino

Vacuum flourescent displays are a beautiful piece of retro technology. Noritake Itron and a few others still build them as dot-matrix or full graphic displays. But the technology dates back to the 70’s and you can find some surplus units available on eBay.

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Flash Arduino without a Bootloader from a Raspberry Pi

November 6, 2019
linux, electronics, arduino

To keep things short: I’ve had an Anet A8 3D printer for a while now and wanted to flash an updated version of its Marlin firmware. For some reason however, the bootloader was broken. So I couldn’t flash it with avrdude by simply using a USB cable. For this case you can find lots of tutorials on how to flash Arduino boards with a second Arduino. I didn’t have a second Arduino at the time though … so why not just bit-bang it from a Raspberry Pi instead?

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Managing containers with podman and systemd

November 6, 2018
linux, container, systemd

A while ago I stumbled upon podman, which touts itself as an alternative to Docker. Not only does podman not use any big fat daemons™ but it makes it rather easy to run containers in a user-namespace, i.e. with greatly restricted privileges on your system. The fun thing is: you are still root within the container!

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Commit Hash Replacement in Git Archives

October 5, 2018
git, linux

Trying to implement some sort of automatic versioning based on your git commits or tags is not as easy as it should seem. The idea is to use a feature built into the revision control system to modify your project files and increment version counters automatically or embed commit information into software builds - in my case: the --version output of Go applications built with cobra.

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Speedtest Plotter

September 19, 2018
container, network, database

I am supposed to have a 500 Mbps internet line at home. Last week it really didn’t feel like that (again). Pages would take ages to load, streams would stutter miserably or simply abort and downloading OS updates simply timed out. So I set out to measure my actual bandwidth over a longer period of time.

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Set up 2FA app for PayPal

March 3, 2018
security

It is becoming common knowledge that you should use two-factor authentication whenever possible. Some services allow the use of TOTP apps on your smartphone, some only want so send you SMS codes .. and others use proprietary tokens.

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Install ESXi 6.5 on a Supermicro X10SBA

January 19, 2018
virtualization, homelab

Trying to install VMware ESXi on a number of Intel Bay-Trail boards apparently fails with a hanged installation right after a message like Relocating modules and starting the kernel. There’s multiple forum posts around the internet where people suggest various workarounds, which never seemed to work for me. One suggestion which stood out to me as most promising was completely disabling the internal graphics chip and using a dicrete graphics card in the PCI Express slot. ...