A wireless battery-powered daylight sensor for measuring a total light intensity in a space is operable to transmit wireless signals using a variable transmission rate that is dependent upon the total light intensity in the space. The sensor comprises a photosensitive circuit, a wireless transmitter for transmitting the wireless signals, a controller coupled to the photosensitive circuit and the wireless transmitter, and a battery for powering the photosensitive circuit, the wireless transmitter, and the controller. The photosensitive circuit is operable to generate a light intensity control signal in response to the total light intensity in the space. The controller transmits the wireless signals in response to the light intensity control signal using the variable transmission rate that is dependent upon the total light intensity in the space. The variable transmission rate may be dependent upon an amount of change of the total light intensity in the space. In addition, the variable transmission rate may be further dependent upon a rate of change of the total light intensity in the space.

An ultraviolet measurement system includes a measurement device that is configured to be portable by a user, and measures ultraviolet information regarding an ultraviolet ray, and a display device that can perform communication with the measurement device, in which one of the measurement device and the display device includes a position acquisition unit that acquires position information indicating a position of either of the user and the measurement device, and a storage unit that stores the ultraviolet information measured by the measurement device in correlation with measurement position information which is position information of when the ultraviolet information is measured by the measurement device among pieces of position information acquired by the position acquisition unit, and in which the display device displays information based on the ultraviolet information and the measurement position information.

An electronic device may have a display with a cover layer. An ambient light sensor may be aligned with an ambient light sensor window formed from an opening in a masking layer on the cover layer in an inactive portion of the display. To help mask the ambient light sensor window from view, the ambient light sensor window may be provided with a black coating that matches the appearance of surrounding masking layer material while allowing light to reach the ambient light sensor. The black coating may be formed from a black physical vapor deposition thin-film inorganic layer with a high index of refraction. An antireflection layer formed from a stack of dielectric layers may be interposed between the black thin-film inorganic layer and the display cover layer.

A technique and apparatus for monitoring a plant canopy over a field is disclosed. The technique includes receiving first sensor values from a plurality of plant canopy sensors disposed in or on a ground of the field under the plant canopy. The first sensor values are indicative of near-infrared (IR) light reflected or reradiated from the plant canopy. Second sensor values are also received from the plant canopy sensors. The second sensor values are indicative of red light that is incident through the plant canopy. A map of the plant canopy may be generated based upon the first and second sensor values.

A battery-less sensor device includes a sensor to sense an environmental condition, a power supply system, a memory, a communication device, and a processor. The power supply system includes energy harvesting devices to harvest energy from ambient energy sources for powering one or more components of the sensor device, and an energy storage device to store harvested energy. The memory stores sensor data associated with the environmental condition sensed by the sensor. The communication device transmits the sensor data to a BMS or remote device. The processor is configured to dynamically select one or more energy sources from the ambient energy sources to power one or more components of the sensor device according to an availability of energy from the ambient energy sources and/or an energy consumption requirement of the one or more components of the sensor device, and to control supply of power to the one or more components.

An electronic device may have a display with a cover layer. An ambient light sensor may be aligned with an ambient light sensor window formed from an opening in a masking layer on the cover layer in an inactive portion of the display. To help mask the ambient light sensor window from view, the ambient light sensor window may be provided with a black coating that matches the appearance of surrounding masking layer material while allowing light to reach the ambient light sensor. The black coating may be formed from a black physical vapor deposition thin-film inorganic layer with a high index of refraction. An antireflection layer formed from a stack of dielectric layers may be interposed between the black thin-film inorganic layer and the display cover layer.

A mobile device includes an outer package, a plurality of photoelectric converters, and at least one processor. The plurality of photoelectric converters are adjacently located and each of which generates power based on light incident on one surface of the outer package. The at least one processor switches operation modes of the mobile device in response to a fact that an output generated correspondingly to light received at each one of a preset number of photoelectric converters among the plurality of photoelectric converters is a low output that meets criterion conditions.

An aquarium photometer system includes a housing unit, an arm, and a mirror. The housing unit includes a light sensor configured to sense light incident on the light sensor and to convert the incident light to a signal. The housing unit also includes an operational amplifier including a first input node, a second input node, and an output node. The operational amplifier is configured to: receive the signal at the first input node, amplify a difference between the signal at the first input node and a signal at the second input node by a gain factor, and output the amplified signal on the output node. The housing unit also includes a potentiometer connected to the operational amplifier and configured to regulate the amplified signal; and a display connected to the potentiometer and configured to show an intensity of light detected by the light sensor based on the regulated amplified signal. The arm at a first end is connected to the housing unit and configured to move the housing unit around an aquarium case. The mirror is located on a bar and positioned within the aquarium in front of the light sensor and at a focal distance from the light sensor and configured to increase an amount of light incident on the light sensor.

A system for monitoring ultraviolet (UV) exposure of a wearer. The system comprises a wearable device operable to sense UV radiation levels to which the wearer is exposed, and to transmit UV radiation information. The system further comprises an external computing device in remote communication with the wearable device, operable to receive the UV radiation information from the wearable device and configured to determine the wearer's real-time UV index value and the wearer's daily cumulative percentage of minimal erythema dose based upon the UV radiation information.

A light intensity detection method includes: determining whether light intensity detection needs to be performed; detecting whether there is a finger touch in an optical detection region of an optical fingerprint sensor if light intensity detection needs to be performed, wherein the optical detection region is located in at least one part of a display region of a display; enabling a light intensity detection function if no finger touch is detected, and collecting light intensity data by using the optical fingerprint sensor; and processing the collected light intensity data, and calculating a value of current ambient light intensity according to the light intensity data.