arduino

9 months_Rebirth

Photo by Nick Bramhall

Interactive Light Installation. Optical fibres, LEDs, Raspberry Pi, sensors, custom software.

Immersive and meditational visual and audio space on the theme of ‘rebirth’

Using light and sound as the main elements for creating an immersive environment, this installation is trying to emulate a feeling of rebirth. More than one hundred luminous optical fibres form a pentagonal light cage that stands dimly lit, waiting for a visitor. When the visitor enters inside it, he/she ignites a light and sound sequence, a performance that will transform the light cage into a meditational visual and audio space, where the visitor is challenged to rebirth.

At the beginning, the light will be low powered and white and the sounds will be simple, distant and low frequency. Then more colours will start to appear, together with more complex patterns, rhythms and rich sound frequencies. The sound will be a mix of digital generated interpolated noise along with natural sounds recorded in an underwater environment in order to emulate the audioscape of the fetus. A final light and sound blast will mark the rebirth moment.

Commission through the Culture fund of the European Union with Manchester Metropolitan University, Fondazione Mondodigitale, I/O Lab and Curated Place

Festivals & Exhibitions:

SPECTRA 2017, Aberdeen, United Kingdom (February 09, 2017)

Pentatono

Kinetic Installation. Optical fibres, LEDs, motors and custom software.

Pentatono is a kinetic light and sound sculpture, where harmony and periodicity are the fundamental elements. Motion, sound and light; all are obeying the laws of the harmonic oscillation.

Five acrylic balls hanging from optical fibers, form five pendulums that are moving in the space using the thrust of small propellers. When a pendulum passes from the equilibrium position (the middle of the motion path) it emits a light pulse and sound tone. Each pendulum is “tuned” in a different note of a natural pentatonic scale. The lengths and hence the periods of the pendulums are accurately adjusted to form visual traveling waves, standing waves and quasi chaos.

Photos of Pentatono

 

Festivals & Exhibitions:

Maintenant 2017, Reenes, France (October 10, 2017)
SPECTRA 2017, Aberdeen, United Kingdom (February 09, 2017)
Bnl Media Art Festival, Rome, Italy (April 13, 2016)
B-Seite Festival, Mannheim , Germany (March 12, 2016)

AP-logo
Selected for 2016 Aesthetica Art Prize Longlist.
LOGOSpecial Price of Kinetica Museum London.
Google-Cultural-InstitutePresented at Google Cultural Institute

The Theory Behind Pentatono

Harmonic motion, a periodic movement between two points, occur widely in nature. A simple harmonic oscillator is used to model and explain many phenomena in both classical physics and quantum mechanics from modelling phonons to describing quantum fields. Beyond that, a vast amount of motions, sounds, and systems in general are analyzable as superpositions of simple harmonic motions of varying frequencies and amplitudes (Fourier analysis).

While this underlying fundamental principle – the fourier series – is a purely abstract mathematical theorem, it is also responsible for our understanding of almost every aspect of the physical, biological and social world; including but not limited to acoustics, economics, quantum mechanics, predicting earthquakes, protein structures, DNA and the composition of distant stars and galaxies.Memo Akten about “Simple Harmonic Motion Series”

The pendulum is a simple harmonic oscillator. The period of a pendulum (T) depends on its length:   where L is the length of the pendulum and g is the local acceleration of gravity. We have chosen different lengths for the pendulums in order to have different periods. After we start all 5 pendulums together, they quickly fall out of sync, because of their different periods of oscillation, and soon they start to form visual traveling waves, standing waves and quasi chaos.

The installation is using the fundamental frequency (resonant frequency) of each pendulum in order to oscillate it. If T is the period of the pendulum, the motor is activated every T seconds for ½T of time.

Graphical representation of five sinusoidal waves with increased periods as they fall “out of sync” and then they meet again in the same point to start over.

Graphical representation of five sinusoidal waves with increased periods as they fall “out of sync” and then they meet again in the same point to start over.

 
Concept animation of the five pendulums demonstrating the visual traveling waves, standing waves, beating and quasi chaos that they form across time.

Ηarmony and periodicity appears in many parts of the work like:

• The harmonic oscillation of the pendulums.
• The combining motion and the patterns that the five pendulums are producing.
• The sound tones are a simple sinusoidal tones.
• Various properties of light like maximum and minimum luminosity or fade out speed are following a sinusoidal form.
• The pentatonic scale is consider a very natural and harmonic scale. It consists of five overtones and is derived directly from the natural physical phenomenon of the harmonic series. To maximize this effect, Pentatono, is using the Pythagorean tuning and not the equal temperament notes.

The Sound of Pentatono

When a pendulum passes from the equilibrium position (the middle of the motion path) it produces a tone. These tones are simple sinusoidal waves. All together they form a pentatonic scale with the following notes.

 

The 1st pendulum is playing an A3 (and randomly the same note an octave higher and lower) A2 and A4. In the same manner the 2nd pendulum is playing B2, B3, B4, the 3rd C#2, C#3,C#4, the 4th E2, E3, E4 and the 5th F#2, F#3, F#4.

The 1st pendulum is playing an A3 (and randomly the same note an octave higher and lower) A2 and A4. In the same manner the 2nd pendulum is playing B2, B3, B4, the 3rd C#2, C#3,C#4, the 4th E2, E3, E4 and the 5th F#2, F#3, F#4.

A pentatonic scale consists of five overtones and is derived directly from the natural physical phenomenon of the harmonic series. To maximize this effect, Pentatono, is using the Pythagorean tuning and not the equal temperament notes. To form the scale we use the following formulas:

Pendulum 1st 2nd 3rd 4th 5th
Frequency Ratio 1 9/8 81/64 3/2 27/16
Note A B C# E F#
Frequency (Hz) Octave 2 110 123,8 139,2 165 185,6
Octave 3 220 247,5 278,4 330 371,25
Octave 4 440 495 556,8 660 742,5

Note: We are using the Pythagorean tuning and not the equal temperament notes.

The Technology of Pentatono

The main parts of the installation are optical fibres, leds, dc motors and acrylic spheres. Everything is controlled using an Arduino microcontroller. A custom android app installed on a phone is communicating via bluetooth with the Arduino and plays the sounds. The phone is also used to control various parameters of the installation (the power of the motors, the led luminosity e.c.t) .

Screenshot of the android app that was developed to play the sounds and control the installation.Screenshot of the android app that was developed
to play the sounds and control the installation.

Inspiration

A major inspiration to this work was the “Simple Harmonic Motion” series of projects by Memo Akten.

References: