In his haste to get home after working well into the night, Steve had apparently left his keys on his desk but did not realize this until he’d reached his car. Frustrated, he made an about turn and headed back to the key fob — luckily, he’d brought his employee badge with him.
As he swiped his employee badge to regain access to the building’s entrance, the lights in the dark, unoccupied lobby came on to illuminate his path to the elevator, on cue. The building’s security system sent a message to the building automation system (BAS) and lighting control systems to alert them that Steve had reentered the building afterhours.