# photoplethysmogram A sensor that streams sample PPG sensor data. ``` static let photoplethysmogram: SRSensor ``` ## Discussion The sample for this sensor is an array of [`SRPhotoplethysmogramSample`](/documentation/SensorKit/SRPhotoplethysmogramSample) objects. You need to provide a reason to record photoplethysmogram (PPG) data by adding the `SRSensorUsagePPG` dictionary to the key in the information property list. You also need the `ppg` key added to the `com.apple.developer.sensorkit.reader.allow` entitlement, as in: ```plist com.apple.developer.sensorkit.reader.allow ppg ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)