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| + | [title] Looking closely at the PCB |
|---|---|
| + | [* black] On The front we can spot |
| + | [* green] Bluetooth antenna (on the board) |
| + | [* light_blue] Battery connectors |
| + | [* orange] U.FL antenna connector, that can be used for testing |
| + | [* violet] U11, U13 - probably some chips behind the shield, which is (unfortunately) firmly soldered. My guess: one of them is ultra-low power microcontroller and the other one is taking care of power delivery to the board |
| + | [* yellow] J1 - place for debug connector (empty in production) |
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