Apple Watch

From Personal Science Wiki
Jump to navigation Jump to search

The Apple Watch is a wearable smart watch introduced by Apple in 2015 which includes a number of sensors that can be used for personal science.

Tool Infobox Question-icon.png
Related topics HRV (Heart Rate Variability), Activity tracking, Sleep tracking, Oxygen saturation

Linked pages on this wiki
Projects (1),

People (1)

Since the first release, Apple Watches include a heart rate sensor and accelerometers/gyroscopes for activity tracking. Since 2020, some Apple Watch models can also do rudimentary sleep tracking.

Since the 4th generation, Apple Watches also include an ECG sensor that can be used to take manual readings and since the 6th generation they it includes a Blood oxygen sensor, though this has been disabled in recent models sold in the USA due to patent issues[1].

Beyond this, the Apple Watch also uses its microphone to regularly record environmental noise levels.

Data storage and export[edit | edit source]

All the data recorded by an Apple Watch is stored locally on the iPhone it is connected too and can be found inside the Apple Health application. Exporting the data from Apple Health is not trivial though. While it is possible to export all data as a full dump of all data from Apple Health, this generates a large ZIP archive that contains the data in an XML format that is not easy to re-use.

Exporting via Health Auto Export[edit | edit source]

The iPhone app Health Auto Export provides a way to export selected data in JSON, CSV or GPX files (the latter for geolocation data from workouts). The CSV format in particular can be used to import data into Excel or other spreadsheet software. While the base-version of the application is free, additional export options can also be made available through an in-app purchase. This allows to automatically sync data to iCloud and also provides a way to synchronize data to other external services.

Projects using Apple Watch[edit | edit source]

Sensors in different Apple Watch series[edit | edit source]

The table below is an abridged version of the one found on Wikipedia, focusing on the sensors that are used on the different Apple Watch series.

Specification 1st Series 1 Series 2 Series 3 Series 4 Series 5 SE (1st) Series 6 Series 7 SE (2nd) Series 8 Ultra Series 9 Ultra 2
Sensors Optical heart sensor 1st generation 2nd generation 3rd generation 2nd generation 3rd generation
Electrical heart sensor (ECG/EKG) No Yes No Yes No Yes
Oxygen saturation No Yes No Yes Yes (Disabled for U.S. models sold from January 18, 2024)[1]
Temperature sensor No Yes
Accelerometer 16g 32g High-g
Gyroscope Yes Improved High dynamic range
Ambient light sensor Yes
Altimeter No Yes Always on
Compass No Yes
Battery life 24h 24h 24h 24h 18h 18h 18h 18h 18h 18h 18h 36h 18h 36h
Date released April 24, 2015 September 12, 2016 September 16, 2016 September 22, 2017 September 21, 2018 September 25, 2019 September 18, 2020 October 15, 2021 September 16, 2022 September 23, 2022 September 22, 2023

References[edit | edit source]