The device displays animated GIF pictures on a rotating cylinder. The GIF pictures can be downloaded from a PC via Bluetooth.
Project tutorial by Harald Bauer
I wrote a C program to generate the header files.
The RPI is not necessary!
It is only useful when recording a video. With the motor control running on the RPI you can adjust the rotation speed of the cylinder to the frame rate of the video camera.
I used the RPI as video camera and used it also for motor control.
I never noticed any issues. The LED supply voltage can be adjusted with the trimmer resistor R2 (see schematic) to 4.5V. With 4.5V LED supply the 3.3V Arduino high level is sufficient (3.3V > 70%*4.5V).
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