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The trigger in the robot turns on the motor at a fixed interval. With more sunlight the traveled distance is larger (2008)

The Solar Spriral Drawing Sunrise is a small solar powered robot cart driving around a pole. This project by Esther Polak was conceived at the Medialab Prado in Madrid during Interactivos?08. I designed and build the electronics for the first prototypes. Recently it has been nominated for the ‘Akademieprijs Astronomie en Kunst 2015’.

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Indoor testing the electronics: solar panel, capacitor bank, trigger circuit and a DC motor (2008)
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Basic circuit (2008)
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Final circuit (controlled by an Arduino as trigger) (2008)
solar spiral drawing sunrise