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’.

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