jremington:
I suggest to start by getting two Arduinos, one to light an LED and repeatedly send a unique signal, and the other to receive it.For the receiver, you will probably need a photodiode rather than an LDR, which is slow and insensitive.
I supect that it will be a challenge to get this setup to reliably indicate your presence in a single room.
Thank you, i have done some reading and decided to switch to a photodiode. The system as you stated will simply be sending unique signals in different rooms, using these unique signals the receiver will relay location information to the user, for example if it receives 'A' the user will be told s/he is the office. Am very new to programming i would appreciate any help you can give me in this area , all the tutorials videos about light fidelity are mostly on talks about the technology.