Ultraviolet sensor for detecting indoor/outdoor condition

A device, comprising:

• an ultraviolet light sensor;
• and
• processing circuitry electronically coupled to the ultraviolet light sensor, the processing circuitry configured to:
• receive signals indicating ultraviolet light levels detected by the ultraviolet light sensor;
• operate the device in a first operating mode in response to detection of a first defined sequence in the signals over a time of day;
• operate the device in a second operating mode in response to detection of a second defined sequence in the signals over the time of day;
• and
• operate the device in a third operating mode in response to detection of a third defined sequence in the signals over the time of day,
• wherein each of the first defined sequence in the signals, the second defined sequence in the signals, or the third defined sequence in the signals is determined by comparing each ultraviolet light level of the ultraviolet light levels with a threshold value that corresponds to the ultraviolet light level based on a time point of day at which the ultraviolet light level is detected by the ultraviolet light sensor, the threshold value varying with the time of day.

An electronic device, comprising:

• an ultraviolet sensor configured to sense ultraviolet radiation in an environment in which the electronic device is present and to generate an ultraviolet index signal indicating the ultraviolet index of the sensed ultraviolet radiation;
• a component;
• and
• processing circuitry coupled to the ultraviolet sensor and the component, the processing circuitry configured to:
• detect an environmental condition of the electronic device based on values of the ultraviolet index signal over time of day relative to a first threshold that varies over the time of day, wherein a value of the ultraviolet index signal is compared with a value of the first threshold that corresponds to the value of the ultraviolet index signal based on a time of day of the value of the ultraviolet index signal and a time of day of the value of the first threshold;
• and
• control an operating mode of the component based on the environmental condition detected.