Reality Grinder

Authors: Andrej Koruza, Mitja Cerkvenik (sound design, microcontroller programming, PureData)
Production: KID PINA
Dimensions: 200cm x 400cm x 40cm (HxLxW)

3-7.6.2015 Festival In/visible cities, Gorizia (IT)
25-26.12.2015 IZIS festival, Izola (SI)


Soundlighter is an audiovisual installation based on the relationship between light and sound and the exploration of their mutual influence in real time.

Using liquid as a medium for the visualization of sound waves which transform its surface into a dance of reflections and shadows, the resulting image is projected onto a curved mirror and in turn reflected onto a cylindrical screen. Behind the screen, sensors stimulated by the changing ratios of light and shadow in the image, synthesize a waveform (sound) that again acts upon the surface of the liquid thus completing the repeating cycle of ever changing light and sound textures.


The installation was created by Mitja Cerkvenik and duo IZLAND (Gašper Milkovič-Biloslav and Marko Vivoda). It was produced by Zavod Projekt Atol and Ljudmila with the support of the Ministry of Culture  and Galerija Alkatraz.

Official Soundlighter page at

Drum Machine V2 

I recently upgraded the drum machine based on Arduino MEGA. It has many new features. The sound quality has improved. It has now a MIDI IN and MIDI OUT. When you enter the Edit mode, you can choose between internal and external sync. It is possible now to Stop, Play and Continue playing the pattern. You can also choose the number of steps of the pattern (from 1 to 16). You can trigger the sounds through MIDI (on MIDI channel 10) or with three buttons (only in Edit mode). I also put a passive RC Low Pass filter that can help you to get rid of the annoying frequency caused by PWM.

I will make the source code available soon. The hardware remains the same as in the older version, exept for the MIDI I/O circuit and the Low Pass filter. So you can start building the old version and then upgrade to this. To get the instructions send me an email at mitjacerkvenik AT with the subject Arduino Drum Machine Code. You will get an automatic reply.

Please donate. You find the PayPal Donate button below. Thank you!

Drum Machine Synthesizer

Arduino MEGA was used for the drum machine and Arduino UNO for the synth module with a MIDI input. Both are enclosed in a "groovebox". Output through PWM, 8 bit resolution, 31372,55 Hz sample rate. I have to thank the authors of Auduino. My project started from it and here is the result.

To get the code for Arduino please send me an e-mail at mitjacerkvenik AT with the subject 'Arduino Drum Machine Code'. You will get an automatic e-mail response containing the source code and documentation with schematics. Detailed ocumentation only exists in Slovene, but a brief description of what you need to do in order to build this drum machine is now available also in English.

If you would like to express your appreciation for my work in form of a donation please do not hesitate to follow this PayPal link:

Thank you for donating, this will help me translate the documentation and continue developing other interesting and useful projects.