WordPress dockerisiert

Die Frau setzt jetzt auch ein Blog auf. Da gerät man schnell ins Spielen. Während dieses Blog hier noch altbacken mit php und mysql auf dem Server läuft habe ich für das neue ein Team aus Dockercontainern aufgesetzt: Für die automatische Einrichtung ein Trio aus Containern basierend auf diesem compose file: nginx als reverse-proxy jwilder/docker-gen […]

Duofern Rolladenmotoren mit Homeassistant

English version of this post here Homeassistant ist mein Frontend der Wahl für Hausautomatisierung. Schönes Interface, in Python geschrieben, und leicht anzupassen. Angefangen habe ich damit wegen des Mysensors-Supports. Letztes Jahr ging es dann daran, die Rolladenmotoren auszusuchen. Leider versuchen die meisten Hersteller, ihre eigenen proprietären Lösungen in den Markt zu drücken. Homeassistant unterstützt zwar […]

Vectorized vortex clock

The Doctor Who intro features a vortex clock. Find it on youtube here (left of the two clips). I went through some pain to vectorize it in halfway decent quality in preparation of building a Doctor Who themed wall clock. In case anyone else wants an SVG version here is my amateur attempt. I know a lot […]

Dynamic pdfs with pdflatex and ocg-p

Ever since I saw the microtype manual, I wanted to have something similar. The amazing thing about it is that you can switch on and off different microtype options and observe the resulting PDF output, I now found the package ocg-p which allows to generate pdfs with dynamically switchable layers similar to the above. I built […]

Running an open WIFI hotspot in Germany

German legislation makes it difficult to run an open WIFI hotspot: Not only will the police possibly search your house if somebody decides to commit criminal acts using your connection, you will also be liable via Störerhaftung for copyright-„crime“ committed using your connection. Despite the difficulties I am a big fan of offering open WIFI, and there is […]

Raspberry Pi – Ultrasonic Distance Sensor part II

Using python for the ultrasonic distance sensor from part one of this post in a project I realized: It is still too slow. In my project I record high queality video using the raspberry pi camera at high resolution. That puts quite some load on the IO. As a result, the timing needed for the […]

Raspberry Pi – Ultrasonic distance sensor

For a current hobby project I need an ultrasonic distance sensor. They work by sending a short pulse of ultrasound and measuring the time $t$ it needs to get reflected back from the first obstacle. A nice introduction can be found here. The distance traveled by the sound $d$ can then be calculated from a […]