# Cellular Connectivity

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### <https://dev.blues.io/blog/announcing-blues-opta-expansion/>

### Connections

The Blues device must be connected with its own 24v power supply.

The Opta connects to the Blues expansion with a standard AUX connector (it’s at easy as connecting two LEGO pieces), and the Opta uses that connection to communicate with the expansion’s Notecard via I2C.

### Arduino Opta Configuration

The Arduino Opta must be configured to communicate via the Blues device. This is done by selecting the correct option in the 'Configuration Mode'.

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### External Antenna

Must be a multi-band antenna with a Male SMA connector. Connect to 'MAIN' connector.

{% embed url="<https://uk.rs-online.com/web/p/multi-band-antennas/1248876>" %}

### Troubleshooting

1. Hold down 'TEST' button on Blues device for 10 seconds to reset.
2. Wait 10 seconds
3. Press 'RESET' button on Opta.