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