SmartThings SmartSense Motion Sensor Trigger lights to automatically turn on when you enter a room Receive an immediate alert if unexpected motion is detected while you're away or asleep Save energy by turning off lights and electronics in areas that aren't being used Set up your flood light to turn on when your car enters the driveway Trigger your smart thermostat, or A/C unit or portable heater to automatically adjust based on temperature or when people come and go