Smart sensors are an excellent option for everyone, from smart-home newbies to devout enthusiasts. These small, battery-powered devices offer simple solutions to common problems at the most basic level. Often forget to shut the garage door? Use a contact sensor to send a notification to your phone when it’s been open for more than a reasonable time. Have a toddler just learned how to climb out of her crib? Put a motion sensor in the room and get alerted whenever she’s going rogue.