Thanks sundberg84, I will give a try.
One last question. I didn't find any note in BOM list. May I use ceramic caps instead of electrolitic ones?
I 'm not able to find electrolitic 0.1uF caps at my local store.

@sundberg84

1. Ok I will check pinouts
2. I understand. So what is the best way in your opinion to feed node parasitically in safe manner? Use voltage regulator to step down voltage to safe 3.3v? Should I expect any significant heat? I'm aware of heat becouse it can trigger false alarm of my PIR

Hi,
I've received boards from dirtypcb, it looks pretty good! Very nice design!

Just have a few questions:

1. May I use 78L33 voltage regulator instead of LE33ACZ?
2. Do you know what is the RAW input tollerance of Pro Mini 3.3V (ebay one, not genuine one)?
   I'm thinking of attach temperature sensor to my PIRs in my home and feed it parasitically from PIR (~13VDC). Do you think is it possible?

Hi all,
It looks very good @sundberg84, It's still a little bit bigger than fibaro switch but costs much much less Looking forward to see your next revision

Is it any chance to place another screw terminal to allow turn on/off not only via radio but with the local button as well?
From other side as a workaround it still should be possible to hard soldering some wires to appropriate pin on arduino side.

I'm wondering why some Asia manufacturer is not able to build a tiny pcb with integrated arduino, nrf radio, ac-dc trafo and relay on one single board to keep small footprint.