Megumin LED display
This repository contains schematics, firmware, host controller code and board layouts for driving of hundreds of 7-segment displays. The firmware and some basic host software may be found in the fw directory. The hardware design files may be found in the hw directory.
This system uses a somewhat involved LED modulation technique. For details on that have a look at the README.rst in the fw directory as well as the well-documented code in fw/display.c.