I have now created a prototype PCB design to hold the LoRa radio and the Arduino Mini.
The schematic is pretty straight-forward:
As is the resulting board which is about 34 x 65mm:
This should fit inside one of the candidates for a repurposed enclosure - an "Eclipse" mint tin.
Design files are available on Github.
I created some custom footprints for the LoRa module and the U.FL antenna socket and these are also available on Github. The LoRa module is quite tricky and might be difficult to solder but we shall see.
I'm having prototypes made at both OshPark and PCBWay simply for comparison. The latter will turn out quite cheaply as long as a cheap shipping option is available.
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