Hi
I made a universal device for mysensors to building easy different nodes. The PCB fits in a small case (Strapubox 6090), so simple sensors can build with minimal effort.

The minimal assembly consists of a Mega328P microcontroller (as seen on many Arduinos), a RFM69CW rf module with 868 or 433 MHz and some little stuff for reverse protection and battery monitoring.

With different assembly options, this PCB can be used for:

• Temperature, humidity and pressure measurements (With BME280 assembled)
• Temp-Sensor above with additional light level (with extra BH1750 on the proto field)
• Cheap temperature measurement (With DS18B20 assembled on the small proto field)
• IR-reader for digital Power meter (with external IR Head connected to the UART)
• Prototyping on Breadboards with soldered pin header

The PCB features also

• ISP pins are connected to the pin header for easy flashing the bootloader
• Arduino pro mini compatible pin header for connecting a cheap USB-UART-board without wires
• Optional LED (for example for active transmission)
• Mounting holes for fitting in the “Strapubox 6090” case
• A snap off proto board, which fit under or on top of the MSN PCB.

Hardware and software can be found on my github repository. Github/se-O-matic/msn/

MSN as temperature sensors (BME280), complete assembly (without batteries):

MSN as power-meter reader with ir-head:

Greets!

Thanks for the answers. :-)

I want to keep the raspberry pi as central. This should fit all my needs in my rental apartment.
For HA, I have chosen a SD-card with application class A2.

For a clean setup, i will try to run HA in docker. So can i use the same Raspberry as gateway and for the controller.
So I dont have to use a "rare" mega328p for a serial gateway.

I report my results, when I find some time to work on it.

Hello,

finally, ... I had time to test the "Option 2".
Because the stock of all shops are empty, I used my old RPI 3 B+. But after all, the CPU runs at 50%. Even the 1 GB ram is half free.

The way wasn't as easy as I thought. But now the setup runs pretty good.
This steps I had to make:

1. A fresh install of Raspian Lite (I used 64-Bit, if this is needed? I dont know)
2. Installed "Home Assistant Supervised", which runs in a docker. (I found a tutorial based on this informations: https://github.com/home-assistant/supervised-installer)
3. Installed the MySensors Gateway with some changes! (https://www.mysensors.org/build/raspberry)
   3b. The manual works fine for 32 Bit raspbian. For 64 Bit you have to edit two files bevor the compile starts. (https://forum.mysensors.org/topic/11456/is-mysensors-rpi-gw-32bit-only/8)
   In my case i have to change the section for the BCM2837 (= RPI3) as described in the post.

Now, I have a clean setup for my smarthome with MySensors Nodes and Zigbee Nodes.

The RFM69 ist directly connected to the GPIO of the PI.

The power consumption is araound 2 W. Somewhat lower when idle.