I've a dimmer in the wall (I assume it is a TRIAC) and I would like to get the "signal" or the dimming position into a MCU as a number 0..1024 (for 0..100%). The TRIAC will never be connected to a lighting load, I just want to gather the information to a MCU. What I will do with the signal (LED, PWM, aso) is not relevant for my question.
I assume that I have to attach some type of load that waste as little as possible power <<1W.
I suspect that this is not even possible since my goggling has given me no result, but perhaps I miss the right concept/words.
EDIT The lighting (probably LED) will be controlled both from the dimmer in the wall and from other sources (probably android app or home wep app), and as soon as the other source says "light on" the light should work even if the dimmer is completely off. The idea with the pot (thank you @Transistor) is very good, the only point is the model of my dimmer is part of a model/line and every piece is very expansive.