Just a short summary of the most important data about cable cross sections and current carrying capabilities. Please note that this article is not a substitute of looking up in your local regulations - I just keep these values here to have a quick guess at hand when thinking about such stuff.
Just a collection of comments on 3D printing
The following article leads the reader through building an LoRA-WAN gateway from an iMST ic880a concentrator board and an RaspberryPi. Optionally is shows the reader how to add GPS, enable remote configuration via the tinc VPN daemon and via a TOR stealth hidden service.
Example how to flash Sonoff basic switches with custom firmware (using cli tools or the Arduino IDE)
How to get started with the STM32F401RE nucelo development board on FreeBSD with gcc and openocd
A short summary of the algorithms required for linear accelerated and decelerated stepper motor control on microcontrolers.
This article describes some of the ideas and thoughts during building my first FDM printer and which lessions have been learned from that project.
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
This is the description of a small carrier board for two DRV8825 breakout boards (or compatible) that are controlled by an AVR (ATMega328p) which runs a small (linear) motion processor that gets it's commands via I2C.
A short summary on how to embed authentication and generally signing with the Austrian citizien card
A short tutorial on designing and applying digital filters.
Description of an easy way of using piezo disks as touch sensors to perform bed leveling with 3D printers or other CNC machines. This blog entry describes the most basic possible way without much external circuits (only an ATtiny13A and two resistors are used)
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
Mini Blog-Post that describes modelling 4 digit NACA airfoil profiles in OpenJSCAD
Mini article about the measurement of capacitance with AVRs with a minimum of external components (in it's most extreme form none external components exploiting the gate capacitance of the micro-controllers input)
In this blog article I'm describing a small automated plant watering solution that's used indoor to grow basil, capsicum and chili pepper indoor.
Since it seems to be a huge mystery to many people this blog post tries to summarize some of the parts relevant to the consumer side of power grid systems.
Short blog post about the casting of a simple epoxy countertop with embedded sink.
Summary of the most basic OpAmp circuits that are usually built as well as their basic properties
A really simple colinear coaxial 1090 MHz antenna for ADS-B, one of the most simple antenna constructions that can be used to receive automatic dependent surveillance squitters using low cost software defined receivers such as DVB-T sticks.
Just a short description of what I've tried (and didn't expect to work) about the usage of 3D printed parts made out of PLA in the typical desktop FDM 3D printing process, i.e. a method to build really low cost parts at home.