Sensor Logger Background Reliability
All sensors, with the exception of Camera, offer some form of background recording — meaning times when the app is not on-screen in the foreground or when the device is locked. To ensure the sensor values are being collected in the background reliably, you should:
Most importantly, grant Sensor Logger background location access — usually termed “Always Allow”. you have to do this explicitly being going to the settings app of your phone. This location permission gives Sensor Logger enough privilege in the background to run. This also applies even if you are not interested in location data. By granting this location permission, Sensor Logger can stay in the background more reliably.
Sometimes, low power mode may interfere Sensor Logger when in the background.
On iOS, certain Focus modes may affect Sensor Logger when in the background.
For Apple Watch users, you have to enable the Heart Rate sensor in order to collect measurements in the background (i.e when your arm is down and the Watch screen is not active).
The Camera sensor does not support background mode due to operating system limitations. You have to keep the viewfinder on-screen at all times to reliably capture images.
Bluetooth sensors may have limitations in the background. It may work, depending on the specific sensor, configuration, and operating system. You’re encouraged to experiment and test before you perform a real recording.
To guarantee Sensor Logger to work reliably all the time, please use the Keep Awake option, which can be enabled in the settings. This option will keep your phone screen on during recorder in, and thus guaranteeing Sensor Logger to be in the foreground all the time. To conserve battery, use Keep Awake along with the dim option to keep the phone screen brightness to a minimum level.