For those of you who want an extremely simple build, I've reduced it to just 5 parts: one 1-megaohm resistor (0805 SMD) one Arduino Pro Mini one Ra-01 LoRa module Male header pins Battery clips See photos.

@evb - correct!

@Mr_sensor said in Easy/Newbie PCB for MySensors: Can I have the pcb in the first shed also working as an extender, so the second pcb will be able to send out topics to the gateway as well? What to add to my code to achieve that? Hello, you must program it to be a repeater. Of course it will need to have radio on all the time, so it cannot be battery-powered. https://www.mysensors.org/download/sensor_api_20#create-repeating-nodes