I tried for quite some time to get a reliable and safe Site-to-Site VPN between two locations but never figured it out completely. Site A runs on a Mikrotik hAP ac as its router, Site B runs on a FRITZ!Box 7530 AX. Since RouterOS v7 Wireguard is supported as an official VPN solution, for the Fritzbox Wireguard is supported since FRITZ!OS 7.50. I wanted a real Site-to-Site VPN so that I can access devices on the other site from both sites.

At the annual Chaos communication congress, in this specific case the 39C3 a talk was given by Hajo Noerenberg and Severin von Wnuck-Lipinski called hacking wasching machines . In this talk Hajo showed how he made wasching machines among other home appliances manufactured by B/S/H smart, or to be more precise, integrate them into Home-Assistant . It was the best talk I have seen in a long time and as an owner of at least two BSH appliances (washing machine and a dryer) I was immediately on fire to get this into my machines as well. At the end of the talk Hajo said he could use help designing and manufacturing a custom PCB for this, as he only had a dev board setup.

KiCAD is my favourite PCB design program. I use it for Hobby projects as well as in my day job. I even wrote a rather successful plugin called kicad-jlcpcb-tools for it that lets the user select parts from the JLCPCB catalog and assign them to the footprints. Furthermore it generates the fabrication data consisting of a zip with all Gerber files and the Excellon drill file as well as a BOM CSV file and a CPL CSV file. These three files can be uploaded to JLCPCBs website to get an instant quote for the PCB including assembly.

Back in 2017 I built two displays for my fire brigade that show alarm data in case of an alarm. These use a 40" Samsung TV + a RaspberryPi 3B. A friend already had a working solution , so I adapted his work. It is a minimal approach that uses a matchbox-window-manager + midori The displays worked fine for all the years but recently I wanted to upgrade the installed RaspberryPi OS from Stretch to Bookworm.

In my last post Attiny1616, PlatformIO and UPDI I descriped how I use UPDI to programm an Attiny1616 using platformio . Since then a few things happened and I thought its a good chance to write up my improvements. UPDI circuit 🔗I realized that it would come in handy if I could program my boards with no 24VDC supply connected to the borad, just the 5V from USB. So I put in a diode in order to supply the 5V from USB to the uC.

I recently started a small side project at work in which I was in need for a microcontroller. In almost every project I did in recent years I used a ESP32 out of convenience or need for wifi. However in this project Space was an issue, so huge module like that was not very appropriate. I just need a few I/O pins and maybe a serial port for debugging, that’s it.

I have access to a lot of EtherCat components, among them the brand new OMRON 1S series servo drives. Obviously I wanted to get them working in LinuxCNC but there were no drivers for them. There were drivers for the OMRON G5 series drives however. So I compared the PDOs used in that driver with the PDOs of the 1S series. Turns out they are identical 🤓 I cloned the git repo of linuxcnc-ethercat and began to tinker around.

I’m planning to use a Barth Elektronik STG-850 mini-PLC for a project. The main reason to pick this PLC was the size of just 93x45x15mm, the low price of 150€ (low for an industry grade PLC) and the claim to support “Open Source programming” using the Arduino IDE. In the meantime that claim is no longer on their website and the manual for it is gone as well. There is a GitHub repo that was linked in that manual which provided the integration into the Arduino IDE. Unfortunately there was no activity since 2017 and the manual said a Arduino version 1.8.3 is needed.

In my previous post on this topic I successfully managed to get LinuxCNC with EtherCat running on a Beckhoff CX2040. That was over a year ago and since then I didn’t have the time to dig deeper into the matter. Until now, and a lot has changed in the meantime …

Back in 2016 when we completed building our house I installed a home server in my basement networking rack which I always refer to as the “open wound” 😁 That’s because It is mounted on a laser cut sheet of zinc coated sheet metal that forms a rack mount shelf and looks hacky as hell. These pictures are from day 1 and some things have changed in the meantime.