wvmarle:
That depends highly on how you power the board and how you draw the power from the board.
Afaik I can connect the LCDs to 3.3V directly without a problem.
A barebones ATmega processor. Use the Arduino board for prototyping, then the final project on just a processor with minimal peripherals.
If I just use the ATmega I will have no power regulator, right?
Use the sleep modes for additional power saving.
Are you referring to ATMega or LCDs here?
A Pro Mini board has the fewest extra components (do get rid of that power LED) so will give you the easiest route to a low power system.
That was my thinking.
Note that LCD screens themselves tend to use so much power that the savings by not using a development board may be negligible.
Mhh I read that they use less power than 7-segment-LEDs, that's why I went for this approach. Unfortunately I can't find any information about power consumption in the data sheet
Do you have some circa numbers for me?