PythagotronPythagoras of Samos was a man with many hobbys. I know him primarily for his experiments with strings and their musical properties. Thats why I call this robotic string instrument “Pythagotron”.

It features:

  • 2 octaves of pitch range
  • fast and precise intonation
  • 4 actuators for striking, muting, punshing, damping and shorten the string
  • modular and parametric design (OpenScad)
  • most parts are 3D-printed or easy to gather
  • open source


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Teaching with MuVisu and Boomwhackers

In this post I like to give you just a little example of how I use MuVisu for teaching a band for mentally challenged people. The technical setup consists of a laptop connected to a beamer and speakers. The beamer is used to project animated musical information onto a wall so that everybody can see it. The goal is to lower the difficulty to read the information and translate it into musical action. This way I get room to focus on certain individuals while the rest of the group can practise independently.

Boomwhackers are colored and tuned percussion tubes that are great for making music in a group and to learn basic musical concepts. However, to coordinate playing a piece together isn’t easy – even for trained musicians. I use MuVisu to overcome this difficulty:

Boomwacker_screenshot Boomwhacker_liveB

The left picture shows MuVisu displaying a meleody I have arranged in Reaper. On the right side, you can can see the group playing the melodie. I can say that the participants really like to play Boomwhackers this way and that the outcome really isn’t bad. MuVisu enables me to teach music I couldn’t teach otherwise (with this group) and thats something I’m really proud of:)

update: here is a little Video. The quality isn’t good but enough to get an idea how it works:

An introduction to MuVisu

In this video I describe the current version of MuVisu, a program I’ve made to help learning musical instruments. It is insprired by interactive music games like Guitar Hero, Rock Band or Rocksmith. It’s focused on an universal approach of high customizabillity to make it usable for a wide scope of musical instruments as well as different learning-settings and -goals.

The project is hosted here:


My PCB-Milling-Toolchain


PCB-milling is an interesting alternative to the traditional PCB-etching method, because it doesn’t involve chemicals and the mill can also be used to drill the holes an cut out the board. I think i t’s also faster (never did etching). On the downside, the process is not easy to handle and it’s hard to level the surface of the PCB precisely to get a consistant quality of the traces. I haven’t enough practise to tell how fast the tool wears out and how the costs add up compared to the traditional etching method. But I finally managed to get nice results from PCB-milling and like to share the setup with you by describing the toolchain I used. The tools are all open source, by the way:)

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crazy experiments: motors, frames and propellers


  I got a crazylfie micro quadcopter for my birthday and love playing around with this remarkable open development kit. Yes, it’s not just a very small but powerful quadcopter, it is also comes with all the design files and the tools necessary to modify the software and/or hardware, which in it’s current state is already quite mature. Having said this, if you look for a ready to go quad copter with all cutting edge features – look elsewhere. While the hardware with it’s 10dof sensors, fast cpu and expandability is – considering it’s size – quite complete, there are still a lot things to be developed hard- but foremost software wise. But this is not a downside, because the product crazyflie is not exactly a quad copter, it is a quad copter construction kit with every bells and whistles whith a blog, a wiki, a forum with a whole quad copter construction community, inviting everyone to participate. And for that I’m just loving it.

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Hi, just want to show you a new project I’ve almost finished:
The pLamp


features are:
-3-channel brightness control (each two of the bulbs are separately dimmable)
-adjustable focus position via stepper driven mechanic (see pictures)
-wireless remote controlled (3channel brightness + focus position)
-remote can be hooked to a computer to control the lamp via client e.g. for
advanced disco-action-controlling;)
-most parts are 3d-printed, the rest of them are easy to gather
-6 Standard 5W Led GU5.3 bulbs

It was originally designed to be a living room lamp, but with color filters
(different color attached to each channel) plus a small disco ball, it think
it’s a nice disco lamp too:)


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