In context of getting the MCU on Pro Mini and ATMega2560 (chip is ATmega328 and ATMega 2560) to sleep and power down modes, so as to run on one set of battery for months, appreciate idea and comment.
Initially, I looked at web postings and get the following general idea. Did I miss anything?
Is sleep mode done via ATMel factory library, Arduino-level user contributed library, or the Arduino IDE? Many web posting are along the line of getting it partially working but only at half expected current reduction, etc. That is, current do reduced, but, not enough.
Are there several such library?
How are they?
Which one is better support and more functions? (no need for easy to use, can do registers programming, when needed)
Many thanks in advance