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pxt-calliope/docs/reference/control/event-source-id.md
Ron Hale-Evans c55716e148 Control pages now link to Lancaster
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Event Source ID

Return a code representing the origin of the event on the bus (button, pin, radio, and so on).

control.eventSourceId(EventBusSource.MICROBIT_ID_BUTTON_A);

This is an advanced API. For more information, see the micro:bit runtime messageBus documentation