I2C communication between RaspberryPi and an AVR based I2C slave
9 mins
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
The Blogsphere - How pingbacks work
4 mins
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.
Where does complex impedance come from?
4 mins
This post describes a simple derivation of the complex inpedance formulas well known from electronics.
Using cheap 28BYJ-48 stepper with ULM2003 drivers and AVR/Arduino
6 mins
Short explanation on how to use the 28BYJ-48 geared stepper motor with the ULM2003 7-way Darlington transistor array.
Fast ballpark calculation of maximum speed for maximum car througput (using simple high-school physics and math)
4 mins
Something most drivers don't want to hear - a basic pallpark calculation of the optimal maximum speed that offers the maximum car througput on streets.
Using AVRs GPIO pins with avr-gcc
5 mins
How to use the GPIO pins on the AVR microcontrollers when using avr-gcc
Comparison of TAN mechanisms and alternatives
17 mins
This blog post should provide a short overview of TAN alternatives and methods as well as their pitfalls and security
Wie DKIM und SPF funktioniert (und weshalb Mail-Forwarding eine schlechte Idee ist)
7 mins
This is an article (in German because of it's specific audience) about SPF and DKIM features that prevent mail spoofing and it's effects on mail forwarding
Building a simple 3D printer (and what turned out to be not so simple)
20 mins
This article describes some of the ideas and thoughts during building my first FDM printer and which lessions have been learned from that project.
