Turn off a zone when solar power drops below the defined value

Do more with your Android — automate wallpapers, messages, organize and back up your photos, and increase your battery life. IFTTT is free and makes it easy.

Did you know that turning off the lights whenever you leave a room can reduce greenhouse gas emissions by 0.15 pounds per hour? That's kind of a big deal. While small changes like that seem easy in theory, building those habits can take...