I want to make a Timestrip. What I mean by that is a very low power circuit that runs off a CR2032 or smaller that counts up to a certain time in hours or days. When the time comes, it turns on some kind of indicator and then waits for reset from a button or similar.
I set out to make this but don't know what to use for the indicator. I can't use an LED because LEDs are not low-power. What should I use instead? And is this circuit a good use for the 32.768KHz crystal driving mode?