How to use ADB over TCP/IP instead of USB
How to get started with Android development on FreeBSD (using Android Studio)
A short summary of the algorithms required for linear accelerated and decelerated stepper motor control on microcontrolers.
An easy method to add tags to your static Jekyll generated pages and blogs
This article is a (really) short tutorial on how one can handle messages from LoRA nodes that are routed via thethingsnetwork inside an self-contained JavaEE application.
The blogsphere is a web of interconnected websites. As usual websites are linked like all pages in the WWW but on the other hand they provide an easy way of notifying each other of being referenced by a third party. Pingback is - besides trackbacks - the (XML-RPC based) technology used for that notification.
This article explains how to use an AVR as I2C slave device (basically how to set registers for the TWI controller) and how to interface that to an RaspberryPi running FreeBSD
A short cheat sheet on how to use the git version control system (most basic operations)
A short summary on how to embed authentication and generally signing with the Austrian citizien card
Just a short description of what a JWT is, what it can do for one and how they are realized - and why one would want to use them to identify users in one's web application by using JWTs instead of session IDs.
A really short description on how to build OpenHantek on FreeBSD and how to configure the system - and how to create a FreeBSD port.
Short summary on how to setup the development environment for ESP8266 (Non-OS and RTOS) as well as ESP32 (RTOS) including a short shellscript that's capable of setting up the development environment.
A really short *unfinished* introduction into the various memory models of the x86 architecture
A short summary on how to use the GitHub API with access tokens to mirror all your GitHub repositories and keep them up to date.
This is a short article that shows how one can use Frama-C and the WP plugin to proof correctness or some properties of ANSI C code written for AVR microcontrollers.
A short review about the T4EU1C Sonoff Switch as well as an example how to flash Sonoff basic switches with custom firmware
A short introduction into neuronal networks and backpropagation
How to use Frama-C static analysis and proof assitant with ACSL annotations for function pointers in ANSI C.
Really short primer on ACSL predicates for formal verification of ANSI C code with Frama-C.
Mini tutorial on how to use the NodeMCU Amica and a cheap PIR sensor module to build a pretty simple motion sensor that supports reporting via MQTT messages.
Short tutorial on how to use libjpeg for simple image I/O (to read and write JPEG files to/from disk or memory and represent them as simple in-memory bitmap for simple CV experiments)
Short summary about the k-means algorithm and it's usage
This blog post is part of a short series about WebRTC. It describes the different media sources available as well as how one can do local loopback of a datastream. Note that data transfer is not described in this blog post, only access to webcam and screen sharing streams and direct pixel manipulation.
A really short introduction of the basic anatomy of a Unix-like or Linux daemon process.
This blog post summarizes a method that can be used to develop software in the same way one would when using object oriented techniques with C++, Java or similar languages. It's based on the method used by the previously mentioned languages to implemented that stuff on bare metal.
Since I'm a huge fan of the Erlang programming language and the OTP toolkit but normally aren't working with projects where Erlang is suited or in case some existing code is using already other languages and so I'm not capable of using Erlang I tried to summarize some of the things that I think one can learn from programming in Erlang/OTP even when using other programming languages. Of course this stuff is not enforced by the runtimes and it's harder to achieve on other platforms but the approaches work nevertheless.
This article describes an trick that I'm using in some of my applications to allow one to exchange modules or plugins inside an application at application runtime as well as keeping old versions active as long as they're required.
A short summary of LoRA WAN stuff that's often not seen by device and application manufacturers and developers. This blog post tries to give a short overview of network behavior and internals.
Since a student of mine struggled realizing simple structured serialization and deserialization to and from XML in C# I decided to put together a small tutorial.
Minimal description of the two possible activation procedures of LoRA WAN device activation and the meaning of device activation for the network. This article has been written since the difference between OTAA and ABP as well as the reasoning seems to be a problem for some developers.
A summary and short comparison of various generic (non application specific) data serialization techniques and formats
This blog post takes a look at the pastry distributed hashtable. This is a hashtable that allows resilient and scaling distributed key value stores and that can be used to build a variety of applications on top.
A short view on the role of message brokers in two different context, which problems they solve and what one should be aware of.
This article describes a simple and working solution to automatically upgrade jenkins running on a local servlet container such as Apache Tomcat by using a simple POSIX compliant shellscript (working on Linux, Unices, etc.) as well as a simple Jenkins job itself.
This blog post summarizes one of the methods that can be used with CSS3 adjacent sibling selectors or general sib
A short summary on how to generate a sitemap for search engines automatically when using the Jekyll static site generator
Since I always have to lookup how this works in some examples or hidden deep in the manual I decided to write a short summary about linear extrude, rectangular extrude and rotate extrude
This blog post summarizes how one can access common webcams from C on operating systems supporting the video4linux (V4L) API. This information can be used to built robots, surveillance systems or simply communication applications.
A pretty short blog post about a small nuance that might lead to a huge hit in your search ranking when using static site generators that use nested pre and code tags and may trigger even more errors in case one doesn't use mobile first approach for one's stylesheets
Mini blog post that shows how I integrated DHCP events into my automation solution by pushing commit, release and expiry events into my message broker infrastructure
A short summary about Kalman filtering
Mini note on robust serial communication with microcontrollers (basically: use checksums and synchronization patterns)
A mini summary on how to do OpenGL context creation without using external utility libraries on X11 systems.
This blog post is a little summary or introduction on how to calculate Eigenvalues and Eigenvectors using power iterations that tries to use a little less formal jargon to provide a short overview.
Mini summary about the ADC on the ATMega328p and ATMega2560
A description of a simple implementation of a system clock module for AVRs supporting delay, millis(), etc. This blog post tries to shed some light onto these simple and basic functions as well as some common pitfalls.
Sometimes it's convenient to add annotations to Grafana dashboards and panels using Grafanas flexible HTTP API instead of writing them into a database and fetching them from there using Annotation queries. Since I lacked a complete example and it took me some minutes to find out how this works this blog post summarizes the process.
A short summary on how the box-mueller method works to generate normal distributed random numbers (for example for Monte-Carlo simulations, etc.)
A common error - but the solution is easy to forget. And it's even harder when using the Arduino IDE
A mini introduction and summary on how to create own Python PyPi (pip) packages
Mini summary on how to use the AD7705 with Atmel AVRs
Mini (really short) summary of one way as well as a recipe on how to write daemons in python
This article is a mini summary of the steps that have been required to migrate from the v2 to the v3 stack of the things network, a community driven LoRA-WAN backend solution.
A mini summary on how one can use Python and matplotlib to calculate and render two dimensional static electric fields generated by point charges in infinitly sized space based on Coulombs law and the superposition principle.
Mini recipe and hopefully descriptive summary on how to perform QR decomposition using Givens rotations which forms the basis of many linear algebra numeric applications such as least squares, GMRES, etc.
A write up of the methods used to iteratively solve arbitrary linear equations systems. This includes the definition of Krylov subspace solvers, the Lanczos and Arnoldi algorithm to build orthogonal subspaces, a summary of the steepest descent and projective methods and then as an real world realization of projective methods the conjugate gradient (CG) and generalized minimal residual (GMRES) method.
Short dive into the basics of PID loops
A simple summary on how to dynamically load modules from files in Python similar to the dlopen/dldsym/dlclose semantics in C
Playing around with scraping online status information from a social networks chat service and doing some statistical analysis
A short summary on how to control the Korad KA3005P power supply using Python as well as some simple samples on how to use my own control library
A short summary on the inner workings of the Iterative Dichotomiser 3 (ID3) decision tree algorithm, a small Python playground implementation and application to one toy and two real world datasets out of the world of biology and medicine