September 2021


Active supporter of WikiPedia
Support Wikipedia


Profile for uwezi

Assembling an USBasp

…at eight times timelapse it only takes 4 ½ minutes…

LaTeX: x11names resorted

I like the color palette which the xcolor package offers under the option x11names, but I find the list of colors in the xcolor manual a bit confusing. The colors are sorted by names and not shades – so today I made my own little table.


Continue reading LaTeX: x11names resorted

(Deutsch) …und die Deutsche Domain – schon wieder…

Sorry, this entry is only available in German.

An USBasp in a new design II

Most of the time I design and debug my AVR projects on solderless breadboards nowadays. And for that I have been using some different types of programmers by now: starting with the good old STK500, to different versions of USBasp clones from Chinese sellers on eBay.

In order to connect the programmers to the […]

Continue reading An USBasp in a new design II

An USBasp in a new design

Just a small teaser: today I received my circuit boards from PCBgogo – a layout which I just had sent to the Chinese manufacturer last Sunday.

The finished circuit board from China.

It is a USBasp, which can be placed on a breadboard and at the same time supplies the power rails […]

Continue reading An USBasp in a new design

Nerd or not?

Today there was a geocaching event celebrating Nerd Day. I must admit that I wasn’t aware of the significance of today’s date, but I also knew that I can probably be considered being a nerd.

In the early days of the internet, while still writing my master’s thesis in Kiel, I already scored high […]

Continue reading Nerd or not?

(Deutsch) …nicht schon wieder!

Sorry, this entry is only available in German.

Setting up webcam exposure under linux

I had some problems with fswebcam to set the automatic exposure. The exact way how to enter certain parameters is not clear from the lacking documentation, but it works fine if you set parameters through another command line tool.

This is the script behind BirdCam:

#!/bin/bash DATE=$(date +"%Y-%m-%d_%H%M") v4l2-ctl -c exposure_auto=1 v4l2-ctl -c gamma=5 […]

Continue reading Setting up webcam exposure under linux

OctoPrint – a new attempt

It was not so simple to set up a Raspberry Pi as a 3D-print server as I had hoped. It started with issues with the WiFi-dongle, continued to a complete black out on all of my USB web cams and finally I gave up…

I reflashed the SD-card with the latest full Raspbian Jessie […]

Continue reading OctoPrint – a new attempt

OctoPi – WiFi issues

Next step in my journey into 3D-printing would be to set up a server to remote-control my 3D-printer. Since two weeks ago I have a spare Raspberry Pi 2 lying around and Google quickly revealed the existence of OctoPrint.

Ok, downloading the image of OctoPi and writing it to a micro-SD, making the necessary […]

Continue reading OctoPi – WiFi issues