how to send data through a dc line connected to led

[electroyas]

how can i send data signals to units to on led only with two wire power lines dc. Led can not be blinked becaused of this...

[pebe]

Your question is too vague to reply to. What sort of data? What units?

"Led can not be blinked becaused of this.." ---because of what? Why ?

[electroyas]

actually i'm trying to automate my home lighting system with central microcontroller, in order to on off each led lights unit i need to send data throught the dc 12 v power lines without any control wires. Is it possible?

[pebe]

It would be possible - but not easy. The source and load of your 12V lines would have a low impedance and trying to force data on to them would require a lot of power.

You could put the data on to a carrier but that would entail fitting filters in your system to inject the data and retrieve it. Unless you know what you are doing in that field then the simple answer is that it's not possible.

[electroyas]

thanks for the quick reply. It seems that i may have to have a seperate wire for that.