Doe-het-zelf: Remeha-ketel en Arduino

Ik wilde de CV-aanvoertemperatuur van mijn al wat oudere Remeha-ketel, de W21/28 ECO, op een lagere temperatuur instellen. Ik hád de instelling 60° al gekozen met behulp van het “gewone” bedieningspaneel, maar ik wilde lager. Dat kan, maar je hebt er een “servicedisplay” voor nodig. Gelukkig vond ik op internet verschillende afbeeldingen van de Remeha…

Run Ubuntu Desktop on a Raspberry Pi 4

A Raspberry Pi 4 is a pretty competent computer for a student’s desktop. I have setup two of these for my kids and apart from a few proprietary packages, everything works well. However, Raspbian won’t cut it, mostly because its’ Firefox is way too old. Hence we’ll go install Ubuntu Desktop.

Set Windows time at boot – the ultimate reference

While preparing some 200 non-domain-registered Windows 7 systems as POS systems, we came across a couple of dead BIOS batteries. Time on these machines would start 1-1-2009 every time and while you could forcibly setup the correct time by pushing a couple of buttons inside of Windows, the question arose if it would be possible…

Upside Downternet v2.0

I’ve always wanted to implement upside-down-ternet, but lacked the resources. But now it’s 2016 and you can make your wifi-stealing-neighbour’s web browser do all the hard work. This means that a simple OpenWRT router will have enough power to flip the internet – all of it, except for the ssl-protected areas. Update 2019/2020: this site…

Synology Crash Recovery

So, you own a Synology Disk Station and a disk broke. You messed up by trying to replace the wrong disk. You tried to fix it by reinserting the right disk but that didn’t help. Then you messed up even further by trying to change the volume – or something. You can’t even remember exactly…

Syslog-ng intrusion detection

There seems to be a problem using the file() destination for /proc files in Linux. When implementing Securing Your Server With Syslog-NG you will run into it. Please read below.

(Not) rooting RK3066 systems

The update updated, 2014-04-28: unbricking is fairly easy, see https://valentijn.sessink.nl/?p=517 Please note that I received some reports from people that tried to flash their RK3066 stuff – but it would not boot afterwards. And in fact, that’s what I experienced when I tried to flash my Minix Neo X5.