How to read battery level from Arduino while it is powered via 9v Battery barrel jack

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I would like to know how to read battery level from Arduino while it is powered via 9v Battery barrel jack.

Thanks, Jyoti RAJ

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With battery level you mean voltage. You can measure voltage using one of Arduinos analog inputs. As 9V would kill your Arduino you need a voltage divider which allows you to measure a safe voltage that is proportional to the battery voltage.