X10 one way dimmers schematic

[franzelare]

Hello all,

I use some X10 dimmers at home (LW12 from what used to be marmitek), some one and some two way.
For the headlights in our bed I use one way since the two way make some noise what is annoying at night.
But now i want to detect if these dimmers are on to use the information in some scripting.

Did anyone ever come across the intenal schematics of these X10 dimmers?
Or an other small detection circuit to see if the dimmer is on using an arduino?