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Hello Boilevin, dear All,
it took a little longer until I came back. Now I had a good progress. In more detail:
1. I changed the bluetooth HC-05 connection according to your picture. (Maybe the connectors holes on the boards, that I had wrongly used should be removed).
2. It took some time...
Hello Boilevin, I had some progress. Bluetooth is still an issue.
In more detail. Thank you for the advice with the Jumper. I was not aware that it can be done in this way. So I changed it (soldering). I had two more issues. One caused by myself as their were two different currents on the...