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The way this circuit works is that the door bell has a force sensitive sensor which when rung activates the sensor and this sensor is connected to the lights to all the rooms in the house which  start blinking on and off intimating that someone rang the bell. At the same time the lights outside the house light up if it is night time. Weather it is day or night is judged by a photo resistor sensor connected outside door .The blinking of all house room lights go on until the door is opened. There is a force sensor present on the door which judges the opening and closing of the door. Once the door has been attended the outside light switches of and the room lights function normally. 

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