I am fairly new to Arduino. As far I know all official Arduinos run on 5 volts. Or there is Arduino versions that run from 3.3V? I need use Arduino with devices which chipsets all use 3.3V logic level. Do I need modify Arduino to make it 3.3V powered, like described in this Tips, or there is another way? I plan get Arduino UNO R3 ATmega328P board (comes with bootloader for Arduino UNO ZT).
Arduino Pro Mini comes in 3.3v and 5v versions.
You can use different possibilities:
Use Arduinos which are already 3.3V by default (like Pro Mini, Due if I recall right)
(removed after valid comment of minto below)
Use 5->3.3V adapters, most general devices have adapters which can be bought separately (for under 1$) to convert 5 to 3.3V (including logic level converters)
What about just getting the bare chip so you can run it at whatever rail you want? Seems like the simplest and easiest solution.