Hi,

Im creating a device that needs to count down a certain period of time which could possibly be weeks, but it will be battery powered, so i'm wondering the best way to do this in order to maximise battery life.

I'm going to have the time remaining displayed on an LCD screen for 5 seconds whenever a button is pressed and this will save power by not powering the LCD all the time, but obviously the PIC needs to be running the whole time in order to keep time.

Does anyone know of any tricks to save power?

Pic i'm working with atm is 18F1320

Cheers