[attachment=4306]
Energy saving through counter

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abstract

Present project is designed using AT89S52 microcontroller to count the number of person present in the room and to save the energy used by the appliances. The project utilizes the IL74 optocoupler which is used to detect the visitors. If a person enters in the room then optocoupler will detect the person and the buzzer will generate a sound and there will be an increment in the number of person on the LCD. LCD used in our project is JHD162A which is used to display the number of person

what is the crystal range used

please go through the following threads for more details on Energy saving through counter.

http://studentbank.in/report-intelligent...tem--16456

http://studentbank.in/report-ensave-elec...ergy-saver

hello ,
i want a ppt on automatic room power saver visitor counter .