Arduino newbie here! I'm a programmer but my hardware knowledge is ... slim.
I'd like to build a clock type wake up timer for my daughter, using an Arduino type board. Probably overkill, but it's practice for me, not just the end result! The idea is that is sleeps all night, then around say 4, gradually fade on a red LED. At 6, which is when she's allowed to come in, the red LED switches to a green, or some colourful sequence that tells her it's time. At a later time, maybe 7/8, it goes back to sleep to conserve power.
I have an Arduino Uno, but looks like I'll also need an RTC, and I've read that the sleep power consumption is ~40mA, which on batteries is what? A day or two max?
So I'm thinking I can't do this with a Uno.
So, my question is, are there any very low power Arduino compatible boards with built in RTCs that I can use for this project that will get me up and running as quickly as if I was using the Uno?