pxt-calliope/docs/reference/radio/set-group.md

# Set Group

Sets the group id for ``radio`` communications. A micro:bit can only listen to one group ID at any time.

Unless specified, the group id is automatically inferred from the script source. Every script with the same exact source code with start with the same group id.

### Parameters

* ``id`` -- a [number](/reference/types/number) between ``0`` and ``255``.

### Example

Sets the group to 128.

```blocks
radio.setGroup(128)
```

### See also

[receive number](/reference/radio/receive-number), [send number](/reference/radio/send-number), [on data received](/reference/radio/on-data-received)