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i want to do room security system,in that i want detect the person or anything entered in the room not only from door from any side of the room,so plz suggest me which sensors i have to use for this
Thanking you, Mujeeb
i have gone through Pyroelectric Infrared Sensor IRA-E940ST1 Series but i am not getting up to how much range it will sense and is it accurate or not ,better than this any sensor is there please suggest me....
you need a microswitch against each wall. then you'll be able to detect ram raiders knocking down the walls.
subspace sensors might be useful.
"then you'll be able to detect ram raiders knocking down the walls"
What about attacks through the ceiling?
Or tunnelling up through the floor?
"subspace sensors might be useful"
Maybe also an infinite improbability detector - for people appearing for unlikely reasons...?
Heat-based sensors are cheap and works reasonably well but can be fooled, as you see in MI films. If they don't see a temperature variation moving between the facettes of the sensor, it will not generate any alarm.
How about a laser scanner? Either having a large number of mirrors and have the ray bounce around before reaching a detector. Or use galvanometers and sweep the ray around the room and detect the expected intersection points. See LADAR or LIDAR.
Or go for a web cam and analyze the image - a number of web cams or graphics cards comes with software for that kind of image processing, sending emails or similar in case they detect a change.
Use a three-dimensional microphone setup and listen for sound. With volume processing you can figure out if the sound is comming from inside the room or if it is just outside noise.
Or maybe go for ultrasonic range finding - an arrayed sonar with multiple sound emission points to avoid dead zones.
Maybe pressure sensors in the floor?
Or if the room isn't too large (or if you place the sensoring system in floor or roof) you could go for a capacitive system, reacting to the water in our bodies.
Sensors analyzing the variation in CO2 in the room.
Options, options. Lots of physical properties can be used to create an alarm. It's just a question of allowed cost. Allowed size. Allowed sensitivity. Allowed probability of false alarms. Allowed visibility.
In the end, you can't really have any problem finding a possible solution. Then it's just standard work, figuring out what hardware + software that would be needed to implement the solution. So it falls back to you. What problem do you want to solve. What resources do you have. What have you done. What problems have you seen.
securitysolutions.com/.../
There are hundreds of other magazines and thousands of other websites related to this topic - you have plenty of material to work on!
It's not like this is some new or obscure field!