if any one of person is in room the electrical power should be connected in this time one or more persons are entering in side that room at that time also that power should be ON .Now that persons who are all inside that room one by one is coming out that power should not be OFF but the last person who is coming out side off the room that power should be OFF
this is my concept of my project for this concept please design a circuit for me please send me replay for this concept
Mail from TM
You have to count people with optical switches or infrared detectors. Then using dsp or up processors and figure how best to establish number of people in room.
See below Motion Detectors - Professional and a DIY Version
See a Related circuit here Optical Obstacle Switch.
A pair of optical switch-sets for every door that leads to room. Only if object cuts both beams then you count one. It is the idea you have to develop, Circuits are on the web.
See also - InfraRed Detector for Proximity Switch and InfraRed LED Flasher for Optical Switch
A pair of optical switch-sets for every door that leads to room. Only if object cuts both beams then you count one. Even windows need sensors, if you expect some to use that for movement. But some may slip in between beams, you might have see that happen.
Motion detector - Wiki
An electronic motion detector contains an optical, microwave, or acoustic sensor, and in many cases a transmitter for illumination. However, a passive sensor only senses a signal emitted by the moving object itself.
Other methods are RFID fixed on every person. Then it may be foolproof. Also as most have cellphones, track the phones with GPS and count people in room. A footrug with a weight measurement can also count people moving thru door. But a few may jump over them, so it has to be foolproof log footrug.
- Optical Occupancy Detector
- People sensing technology - SenSource
- Light Detectors and Optical Sensors
Updated - 10th Jun 2015