An ordinary automatic room power control circuit has only one light sensor. So when a person enters the room it gets one pulse and the lights come ‘on.’ When the person goes out it gets another pulse ...

Hotel rooms are often furnished with an interior key-holder near the main door which enables the ac power supply to everything in the room only when the key/keycard is hanged/inserted. The circuit ...

New European regulations mandate that within 5-7 years new buildings will be near zero emission. Lighting is a major energy user in commercial and domestic buildings alike, and these regulations have ...