The simple circuit presented here will be automatically switch ON the light / fan on entry into the room and switch OFF the load with preset delay on leaving the room. This will reduce unnecessary power consumption. This circuit is useful in drawing room, study room, dinning hall, TV room, work place, cubicle, visitors room, washroom lighting, exhaust fan, corridor lighting, staircase lighting, lift etc. Using LED2, where much lighting is not required, saves more power than using the relay RL1. PIR ( Pyroelectric / Passive Infra Red ) sensor , which outputs signal on detection of presence of humans by their motion, i.e., change in IR radiation emitted by the body.