TESmart KVM-Switch HKS0401B2U-EUBK (4× HDMI 4K @60Hz)

Disclaimer: the experiences described here are my personal opinion. I bought the product privately directly from the manufacturer and paid for it myself.

In the meantime, I often have the situation of having to switch between different computers, e.g. laptop and PC or PC and Raspberry Pi. Monitors usually offer several inputs, so switching here is usually not a problem. However, there is still the problem of having to move the keyboard and mouse around as well, which can be very cumbersome in the case of stationary PCs under the desk.

KVM switch TESmart HKS0401B2U-EUBK

The solution: a KVM switch. KVM stands for “Keyboard Video Mouse”. Such a switch is connected to a monitor, keyboard and mouse and forwards the connection to one of several connected computers. I chose a model from TESmart, which allows it to be mounted on a wall or under the desk. Furthermore, it also offers practical functions such as “USB passthrough”, which are often missing in simpler models. There are also models that are intended as a desktop device, but otherwise work in the same way.

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IKEA Vindriktning with Tasmota and SCD30

I recently reported on my first experience with Home Assistant. The reason for this was that I wanted to collect the data from a suitably modified IKEA Vindriktning air quality sensor. The alternative firmware Tasmota, which can be used on ESP8266 or ESP32-based microcontrollers, serves as the basis for expanding the sensor. In addition, I now use the Sensirion SCD30 to measure the CO2 concentration in the room air, the relative humidity and the temperature.

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Home Assistant

Tasmota, web interfaceRecently I’ve been working on a small craft project: extending an IKEA Vindriktning air quality sensor with a D1 Mini to read the data and forward it to a server via MQTT.

See also Sören Beye’s Github repository for the conversion. However, instead of this firmware, I use Tasmota based on these instructions from Blakadder, which is much more convenient to set up and configure. See also the Tasmotizer on Github.

When I was looking for a suitable server, I quickly ended up at Home Assistant. This is a free software solution for integrating numerous smart home devices and can also be used on a Raspberry Pi 3 or 4. In my case this is a Raspberry Pi 4.

Update 2022-08-14: In the meantime I have expanded this with another sensor for CO2, relative humidity and temperature, see the article here.

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Pioneer SE-MS7BT – new ear pads

I bought the Pioneer SE-MS7BT headset a little over five years ago and it has worked well the whole time. But now the surface of the ear pads has peeled off. Fortunately, these pads are available as replacements from various manufacturers.

Attaching the new pads is a bit cumbersome because the headphones do not have a flat surface, but are slightly curved in one place. But the result is convincing – the headset is now like new and the new cushions also fit very well.


Does anyone remember Meltdown and  Spectre? These vulnerabilities were discovered in June and July 2017 and publicly documented in early 2018. As a result, countermeasures have been taken by software manufacturers for both operating systems and applications, some of which also lead to reduced performance.

As reported on https://www.ncsc.admin.ch/retbleed-en, researchers of the ETH Zürich now discovered a vulnerability in one of the counter measures – retpoline – affecting CPUs by Intel and AMD which got the name “Retbleed” (CVE-2022-29900, CVE-2022-29901). Also see the description at https://comsec.ethz.ch/research/microarch/retbleed/.

PhotoSwipe 5

PhotoSwipe version 5 is now available. This version has a modular structure and has been fundamentally revised to also work reliably with current browsers and smartphones.

My WordPress plugin Lightbox with PhotoSwipe will also use PhotoSwipe 5 in the near future. Since any previous adjustments regarding styling are not compatible with PhotoSwipe 5, the older version will initially continue to be available as a selection.

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