I have a test going and it uses a battery. This is a bare bones 328P-PU on a breadboard. I have a few LEDs attached to pins to show me when each part of my program runs. To save battery life I disconnect the LEDs when I am not around.
My question is : I know having the LEDs removed will save power, but the program is still making the pin "blink" every 60 seconds... does this eat up a lot of power? Does a pin being put HIGH then LOW and back again every 60 seconds use up significant power (and if so just how much) ?