Smart home system using motion sensing for occupancy determinations and display screen activation determinations

A method for using a system for sensing or control, the method comprising:

• operating at least one infrared sensor of the system;
• operating an energy-consuming lighted screen of the system;
• storing, in one or more memory devices of the system, indications of occupancy detected by the at least one infrared sensor in N-minute buckets;
• causing, by one or more processors of the system, the system to operate in one of a plurality of states, wherein the plurality of states comprises:
• an away state that is entered after away-state criteria are met based at least in part on the indications of occupancy detected by the at least one infrared sensor;
• an arrival state that is entered from the away state when at least two of the N-minute buckets that are time-wise adjacent are populated with at least some of the indications of occupancy;
• and
• a wake-on-approach state in which the lighted screen is activated when at least one of the indications of occupancy is detected by the at least one infrared sensor.