Can you connect the Arduino Uno R3 clone in the Arduino cloud? If you can, how? Please help me.
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As far as I know: No.
Adding a LAN or WiFi shield gives you network connectivity, but it doesn’t automatically make an Uno R3 compatible with Arduino Cloud.
The Arduino Cloud officially supports only certain boards (mostly with built-in WiFi and specific firmware).
Had you checked the cloud board compatibilty list you would know that the UNO R3 is not supported. Now would be a good time to check so you can pick an appropriate board. That board will depend on the nature of your project. Things like power requirements, portability, sensor support and maybe memory.