I only had a 24 hour and inspiration for making badge before StartUp conference in my hometown, but I failed, however conference failed too. So after few days I decided to resume this project. Actually, this description is temporarily, later, I will write more detailed information about Dum-eBadge project.
Arduino MIni Pro
Atmega328 3.3V 8MHz
Switches and Multiplexers / Analog Switches and Multiplexers
Displays and Inverters / LED Displays
Batteries and Battery Accessories / Batteries