Electronic devices with motion-based orientation sensing

Headphones that play audio for a user, comprising:

• left and right ear cups having respective left and right speakers with which the audio is played;
• sensors on the left and right ear cups that sense finger positions on the left and right ear cups as the user grips the ear cups;
• a motion sensor that detects a motion path of the headphones as the headphones move from a first position to a second position;
• and
• control circuitry that determines when the headphones are placed on the user's own head and when the headphones are placed on a different user's head based at least partly on the motion path of the headphones, wherein the control circuitry is configured to:
• select an unreversed channel assignment configuration for the audio when the motion path of the headphones is in a first direction relative to the sensed finger positions;
• and
• select a reversed channel assignment configuration for the audio when the motion path of the headphones is in a second direction relative to the sensed finger positions.

Headphones that are worn by a user, comprising:

• speakers;
• a motion sensor that gathers motion sensor data;
• grip sensors that distinguish the user's left hand from the user's right hand on the headphones;
• and
• control circuitry that plays audio through the speakers and is configured to:
• determine that the headphones are on the user's own head when the motion sensor detects motion in a first direction relative to the user's left and right hands;
• determine that the headphones are on another user's head when the motion sensor detects motion in a second direction relative to the user's left and right hands;
• and
• configure the audio based at least partly on whether the user places the headphones on the user's own head or on another user's head.