The Banana PI Zero has only 500 MB Ram. Armbian keeps the /tmp directory in a Ram Disk which has only 197884 bytes available: So I ended up with the following errors when I tried to install pyspark, numpy or other bigger libraries: Memory Error [Errno 28] No space left Read more…
I liked the Spec of the Banana PI Zero: With it’s quad-core Cortex-A7 it should have more power then the Raspberry PI Zero – it should just have more memory! It is quite easy to set up a Raspberry PI in a way that it starts and automatically connects to Read more…
The ESP32 can provide the functionality of a Webserver. There are plenty of examples where this functionality is used to provide a GUI to control the Microcontroller or to provide information from it. What all have in common: they is very basic and often plain ugly. Therefore the question is, Read more…
The ESP32 provides a Bluetooth A2DP API that receives sound data e.g. from your Mobile Phone and makes it available via a callback method. The output is a PCM data stream decoded from SBC format. The documentation can be found here. I2S is an electrical serial bus interface standard used Read more…
The simplest way to stream music from a Raspberry PI to an external amplifier is to connect the headphone jack to the AUX Input of the amplifier with the help of a corresponding connector cable. From a quality point of view a better approach is to use an external Digital Read more…
I am currently working on a new project which uses Vue.js on the frontend and JAX-RS Webservices implemented in Java in the backend. Both, the frontend and the backend will be deployed with Docker. The solution will need to manage customers, users and provide authentication to protect the web application Read more…
In Docker you expose functionality by specifying a port mapping and then you can address the application on the physical host with the mapped port. I am using Docker quite some time now and this was getting a little bit too tedious because each mapped port needs to be unique Read more…
My main Docker deployments are on a single linux server. I have a central ‘data’ directory where I keep my common data. The application specific data or settings are stored in /srv/. But for testing or demos I am usually using local Docker installations on my McBook or McBook Air Read more…
I decided to build a repository of news headlines: I loaded all ‘New York Times’ headlines since the year 2000 and all Business related news from the ‘Guardian’ into the Solr Search engine. It has never been the intention to process all documents in one run but the goal was Read more…
I decided to build a repository of news headlines: I loaded all ‘New York Times’ headlines since the year 2000 and all Business related News from the ‘Guardian’ into a Sorl Search engine. More details can be found in my prior blog. It has never been the intention to process Read more…