Iphone accelerometer coordinate frame

tszheichoi / awesome-sensor-logger

Collection of tools, resources and sample code to use alongside the Sensor Logger app

MIT License

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Iphone accelerometer coordinate frame #2

Closed saltrack closed 7 months ago

saltrack commented 1 year ago

The sensor logger app works perfectly on an android, however on the iphone app the coordinate frame for accelerometer and gyroscope reading seems to be different. On an Iphone, I see that az is -9.8m/s^2 when the iphone is placed on a horizontal platform with the face up, while the android in the same orientation shows +9.8m/s^2.

What frame of reference does the iphone accelerometer use ?

tszheichoi commented 7 months ago

Please refer to the diagram on this support page https://developer.apple.com/documentation/coremotion/getting_raw_accelerometer_events