Technical description and making of


Kreisverkehr (Traffic Circle) is based on the idea of an antique phenakistoskope, but instead of small observation slits, a photo diode reads the information of the passing by images, and emits to a microcontroller this information. The controller starts an ultrabright 100w LED to emit a flash for 1ms and the slide will be projected.
The projection is divided in two parts and shows a highway in the south of Tenerife/Canary Islands. Each carriageway is covered by one circle with 120 slides. The result is a loop of around 10 seconds. The aesthetic of the image reminds of the first moving images.

First drawings of the installation:

Optical System


All the lenses have to be adjustable in four different directions to make the composition possible.
The lenses are removed from old slide projectors

Structure at the workshop

The drive mechanism is made by windscreen wiper motors, bicycle parts, cooling fans of a computer and industrial bearings.

Calculating the dimensions of the Circles, still of the old school by hand....

CNC Cutting of the segments for the circle.

100 W LED, 6500 Lumen. But as the LED only flashes for 1ms the LED will not achieve its complete brightness.

Electronic components inside: motor driver and speed control for the wiper motors, 12 V power supply for the motors, 9V power supply for the microcontroller, 2x AC Drivers for the PowerLEDs, a DIY microcontroller board with an Atmega16

Some images of the testing: