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
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!