I was looking for a mean to collect data and transmit it via bluetooth. An Arduino UNO associated to an HC-05 BT module seemed to be the right candidates for my project.
Given that this system was intended to be installed in a hard-to-reach location, why not also use Bluetooth for downloading the software? I was quite sure that a lot of people had already done the same and that it would take me five minutes to find a guideline with Google or chatGPT.
In fact no. A lot of project didn't solved the issue of using the hardware UART of the UNO and used a slower software UART instead. And regarding the code uploading, the issue of the board reset was neither clearly solved.
Hence I enventually drew the circuit by myself. Given that this circuit isn't that complicated, but that it is not straightforward for a person not well versed in EE enginieering, I decided to share it.
The detailed description is provided in the wiki
And here is a picture of a prototype:
