I have a simple sketch that checks the temperature, the battery level and a an analog sensor...then compares to last values.
I loop and sleep for 2 seconds...but found the battery dies very quickly.
I found the following link on the punch through site regarding power management, which suggests making use of Interrupts.
But assuming the options I have for waking are: CHANGE, RISING, or FALLING (doubt LOW would fit here)....would this really work with an analog input that could potentially be fluctuating frequently? Or would this essentially end up being the same as sleep()'ing every 2 second as I currently have things?