A)
The workshop is a basic research in autonomous and low energy electronic designs for self-sustaining, “nature-friendly” machines. The primary goal is to build autonomous & kinetic (acoustical) sound machines for specific localities (trees and bushes) in the garden. The sound machines will base on rattles, percussion instruments, strings, etc..
For the the moving and driving we will use simple mechanics and high efficient powerful gear box motors. All machines use low energetic circuits designs and are powered by the electric energy from (tiny) solar-panels. the elementary electronic circuit is called suneater. We will focus on advanced suneater designs, that allow a controlled motor operation for precise mechanic movements and thus defined and clear sounds.

advanced suneater design based on a maxim 8212
circuit



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B)
In addition to analogue circuit designs minimal µ-processors applications may be useful. For the first experiments we will use a ATtiny85.

how to program a ATtiny  
http://highlowtech.org/?p=1695
http://www.kobakant.at/DIY/?p=3996

diy arduino uno/duemilanove programming shield
http://www.kobakant.at/DIY/?p=3996

i etched a small PCB-board


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Attiny85 solarengine (time-controlled)



/*
testrun solarengine
attiny85 internal 1Mhz
mabuchi-motor RF300
3V solarcell
capacitor=3300uF
*/
long randOP = 0;
void setup()
{
randomSeed (analogRead (0));
pinMode(0, OUTPUT);
}
void loop()
{
randOP = random (5000, 10000);
delay(randOP); // 5-10 seconds charging time
digitalWrite(0, HIGH); // sets the motor on
delay(30); // delay 1/30 second
digitalWrite(0, LOW); // sets the motor off
}
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Attiny85 solarsound
Good to imitate high frequency songs and patterns of birds or insects.
The first version of this minimal design was developed by Christoph Haberer by using a Attiny13

Some ATtiny cores does not accept the "TONE" function.
To make it work download the suitable version:
https://code.google.com/archive/p/arduino-tiny/downloads



/*
testrun
solarsound cricket
attiny85 internal 1Mhz
piezo
3V solarcell
*/
int speakerPin = 0;
int numTones = 10;
int tones[] = {5000, 5100, 5300, 5600, 8000, 6000, 5800, 5700, 5500, 5400 };
//
void setup()
{
}
void loop()
{
for (int i = 0; i < numTones; i++)
{
tone(speakerPin, tones[i],3);
delay(7);
tone(speakerPin, tones[i],2);
delay(9);
tone(speakerPin, tones[i],6);
delay(11);
}
//noTone(speakerPin);
}



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(2)

INSTALLATION WORKS
autonomous solar powered sound installation consisting of various electronic sound objects for the garden


GREEN SQUARE (2016)

13 electronic circuits for an uncultivated herb bed with dried earth and withered green.
The geometric shaped circuits convert the sunlight in quiet, natural lively sounds that mimic and vary the acoustic conditions on site. The natural soundscape is also extended by sporadic electronic sounds (quiet noise, buzz and hum).

materials: solar cells, green piezo-speakers, wire, electronics


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CHAIN & NOISE (2016)
autonomous sound installation

15 electronic circuits fixed on a nylon string between two trees.
The circuits convert the sunlight in sporadic white noise sounds (with a flow noise character). The sounds move slowly and randomly along the longitudinal axis. As a result, the disturbing background noises (city traffic) will be gently compensated. The sounds slightly vary, because the noise in turn generates resonances on the plastic capsules.

materials:
plastic capsules, black-white pennant, solar cells, speakers, electronics, nylon string


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(3)