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
You are right! This should be reversed!
If you use 4x the size and keep the amount of pixels (151x40) unchanged, then is this is possible from Arduino point of view. If you increase the amount of pixels (4x vertical and 4x horizontal = 16x) the computational load for Arduino will be too high.
There could be mechanical problems (vibrations) if the cylinder is much bigger. You need to try it out.
Using an sd card together with Arduino would be possible.
I wrote a C program to generate the header files.
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