Accessory identification and configuration and corresponding accessory

An apparatus, comprising:

• one or more processors;
• and
• one or more memories including computer program code,
• the one or more memories and the computer program code configured, with the one or more processors, to cause the apparatus to perform at least the following:
• capturing, with a sensor having a two dimensional array of pixels, an image of one of a set of a plurality of optically-recognizable identification marks formed as part of a surface of a dial of an accessory, wherein each set of the one or more optically-recognizable identification marks comprises:
• a first optically-recognizable identification mark formed as part of the surface and used as a synchronization feature;
• and
• an area sized to hold at least a two-dimensional array of locations, each location sized to hold a second optically-recognizable identification mark formed as part of the surface, where the area is formed at a predetermined location relative to the first optically-recognizable identification mark;
• determining from the captured image a specific one of a plurality of possible accessories interchangeable for use with the apparatus;
• and
• performing one or more configuration operations based on the specific accessory.

An apparatus, comprising:

• a body comprising a groove having a first surface configured to align with a second surface of an accessory when a portion of the accessory is placed into the groove;
• a sensor formed in the first surface, the sensor comprising a two dimensional array of pixels;
• and
• an accessory comprising:
• a second body comprising a dial having the second surface;
• and
• a plurality of sets of optically-recognizable identification marks formed as part of the second surface of the dial, wherein the identification marks for each set are formed to be recognizable by the sensor and wherein each set of the one or more optically-recognizable identification marks comprises:
• a first optically-recognizable identification mark formed as part of the surface and used as a synchronization feature;
• and
• an area sized to hold at least a two-dimensional array of locations, each location sized to hold a second optically-recognizable identification mark formed as part of the surface, where the area is formed at a predetermined location relative to the first optically-recognizable identification mark.