I want to control light in my room with remote control, I used Arduino Pro mini, IR receiver and a relay and at moment everything is working but now power source is the problem. I must recharge batteries I reckon too often for this little project (4-5 days), so I'm looking for ideas how make this consume less power. I though about sleeping mode in majority of time and waking up only to change lights ON or OFF, and now I have problem bcs sleeping mode don't remain as long as I want.