Is there any way to build a device capable of sending an ID signal with IR or RF?
For example, imagine I want my TV to know whose remote is being used (assuming everyone has a different remote).
I thought about assigning a different frequency to each "user", but if we had one million users, that method would me impossible.
My second idea was to send a second signal via WiFi, which based on GPS location would know if I'm close enough to the TV to use the IR signal too.
The TV example is only an idea, not the purpose I'm seeking.
Thank you for your time.