If we enable password in Apple Watch, it will be locked when we take it off at 15th second in default. There are two cases of the lock scenario as the below picture.
Case A: The watch is initially worn and locked.
- 0 sec: A user inputs password to unlock the watch.
- 0 - 15 sec: The unlocked period is 15 seconds in default. The period can be specified on the watch. If the user clicks the watch in the period, the period will be reset.
- 15+ sec: If the watch is worn, it is keep being unlocked (Case A), otherwise it locks itself (Case A.1).
Case B: The watch is not initially worn and locked.
- 0 sec: A user inputs password to unlock the watch.
- 15 sec: The watch locks itself at the time.
How does Apple Watch detects wrist? I suppose the mechanism is run by photodiode sensors not by G-sensor. There are two rules of wrist detection.
- Primary rule: Sensors detect distance between watch and wrist via infrared LEDs.
- Secondary rule: Sensors detect lighting change to determine locking.
The primary rule is easy to be proved. How about the secondary rule? I uses the 3 methods to cheat Apple Watch to keep wearing (unlocking) status.
- Shake a paper below the watch.
- Put watch on an iPad that is playing video.
- Put watch on a glass and shake a paper below the glass.
Photo 1
Photo 2
Photo 3
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