What are the core hardware of a fitness tracker? Bluetooth sensor? ActiGraph Actigrapher? Are these hardware integrated on one chip or separate hardware? At present, most fitness trackers use a Bluetooth integrated master chip.
In addition, the fitness tracker sensor records data directly from the chip as motion data? Or is raw data directly synchronized back to the mobile phone by Bluetooth and processed to the cloud?
In fact, this is calculated in the accelerometer. The calculated value is stored temporarily and needs to be transmitted to the mobile phone via Bluetooth when it needs to be synchronized.