@skywatch
Thank's for your answer.
I'm steel confused.
I'm build some DHT nodes and 2004 monitor for it. Now, I will connect all together.
Rpi with nrf24 as gateway wish to bi a database, but trying with Openhab is unsucsesible (Not work). For start will make a easy upgradable system mostly with nrf24.
If that, with My Sensors, not posible, then must build with WiFi (It's power hungry).
Is any oder system? Or technic?
Time is a relative.

@skywatch
Thank's for replay
If I corect understend:

• first build the gateway (Rpi with Nrf24l01)
• then controller (Openhab or Homeassistant)
• next The nodes
• ...
  Is not posible to turn the flow?

-first nodes (one)
-next monitoring one by one
-then connecting all together ??

And What is the easyest way to build a home monitoring (and automating) system?
Sorry , I'm noob with this. I'm just making a cnc kit and 3d printer.

@dbemowsk
Thank's for replay. I'm just start with MySensors and planing to expand the system later.
I finding that cheap kombination (2560, shield and 3.2" ILI3941 TFT) but cannot find any schematic (wiring, pinouts, working example ,..).
First I wish make simple weather station, later wish to add Rpi as Gateway and more Automation sensors and actuators,...

I need sample 2560 scene controller schematic.
I'm new in mysensors and total noob. My idea is building a simple weather station for monitoring just out/in temp, humidity and pressure (for begining). I buy mega kit for scene controller but don't know how to connect together with nrf24l01 and dht22.
Thear is no schematic or wiring diagram.
Please help.