The wiring is pretty straight forward, I use a digital in to control the dimmer and an analog out for the light. The output drives a niko dimmer this is the one I use : https://www.niko.eu/en/article/330-00701 (you can also do this with 2 modules from eltako SUD12 and LUD12, it is cheaper). On a side note, I would have loved the logo to have a PWM of 100Hz than I could have used a digital out instead of an analog output and would have been way cheaper. Bud sadfally it is what it is.
As I am controlling indoor lighting the sensor is my eye and AQ sent to HA and it can be trusted.
How to control a dimmer with one DI and one AQ can be found in the documentation from siemens very well explained (section 4.2 is where you can find the schematics) : https://cache.industry.siemens.com/dl/files/085/109739085/att_909111/v6/109739085_dimming_with_logo_DOCU_v10_en.pdf
From there I added 2 things:
- being able to control with HA that is the bottom part of my schematic
- stop the dimmer to change value when it reaches the max or the min
It isn’t perfect some things need to be cleaned especially the scale but it works. I don’t know where to upload my file so here is a picture my dimmer controller.
I hope this help.