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Could also get ESP32 instead of Arduino. Just as cheap, way more powerful, and has WiFi+BT included. Even more reasons to not get a RPi.

Yep absolutely works as well. Was just on my phone and gave an example.

But arduino = 5v logic, and esp = 3.3v logic.

Also ESP does have a lot higher base load than a atmega chip. You can do tricks to get those down to microwatts.