373dbefa_jects_for_Engineering_Students__PROJECT_NAME
[SNO] 15 [PROJECT NAME] 
Bidirectional Photoelectric System: Photoelectric detectors are usually unidirectional i.e. they are able to detect when someone enters a particular area but not when leaves it. On the contrary, a system able to detect movement in both directions could be useful to control shops, rooms etc. If installed in a shop it could allow knowing if all customers entering the premises have left them at the end of the day. Or, at home, it could be used to switch on the light (or any other electric device) when one enters the room and to switch off the electric device when he or she leaves it. Additionally it can be used to control the number of people as this circuit switches off the electrical device only after the last person leaves the area.
Top 25 Electrical Mini Projects for Engineering Students
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