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# Event Source ID
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Return a code representing the origin of the event on the bus (button, pin, radio, and so on).
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```sig
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control.eventSourceId(EventBusSource.MICROBIT_ID_BUTTON_A);
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```
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**This is an advanced API.** For more information, see the
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[@boardname@ runtime messageBus documentation](https://lancaster-university.github.io/microbit-docs/ubit/messageBus/)
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