Unique id chips

[Dklepser]

I have come up with a project that I want to try. I have a lot of dvd's and want to create a selection station based on a microcontroller (yet to be decided). I want to be able to embed a chip in the DVD case with an led indicator attached. The chip then will have a unique ID allocated to it, and when selected it would turn the led on.

So my first issue is understanding what my options are around a chip that can be programmed with a unique ID and respond when a micro controller selects it(turning on the led) on a shared bus.

Any ideas would be appreciated.

Thanks

 

[Harald Kapp]

A kind of RFID may be the technology you're looking for.
RFID typically works the other way: you interrogate the RFID tag an dthe tag responds by transmitting it's ID. But noone says that you can't transmit an ID and the tag responds by lighting an LED. It's a bit like NFC using only one direction.

If you don't want to include a battery, you will need a rather powerful transmitter to generate enough power at the receiving end to turn on an LED.

 

[Dklepser]

That's sounds like an interesting angle Harald. As for the power I was going to run a power and comms bus behind the dvd's with the circuit in the DVD connected to it, thereby there should be no need for a battery. I'll have a look at what the RFID tech can do, see if it can work in reverse.

Thanks.