Finally got the PCBs from AllPCB.com (cost 5 Euros and took a total of 7 days from order submission to free DHL delivery to Europe!!!) for my own MySensors Arduino Pro Mini prototyping board. Unfortunately the soldering iron broke during my assembly, so it's not fully finished and I couldn't test it yet, either...
This board is inspired by the Nano IO shields that are offered on AliExpress and improves it further for my needs (and switched to the Pro Mini instead of the Nano).
- Each analog and digital pin of the Pro Mini has its own VCC and GND pins,
- the board also provides its own voltage regulator, solder pins for by NRF24L01+ and RFM69H are provided (plus the 5V->3.3V XC6206 regulator),
- either a tiny 55-pin breadboard or three I²C connectors can be placed on the board.
- One can also use PogoPins instead of soldering the Pro Mini (or headers for it) to burn the bootloader or change fuses on the Pro Mini via the ICSP connector.
All design files are available on GitHub: https://www.openhardware.io/view/538/Arduino-Pro-Mini-IO-Shield