# data[].attributes.body
"When Bluetooth-enabled devices are close to each other, they automatically detect each other. Bluetooth uses 79 different radio frequencies in a small band around 2.4 GHz. This band is used by Wi-Fi too, but Bluetooth uses so little power that interference with Wi-Fi communication is negligible."

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Temperature sensors work by providing readings via electrical signals. Sensors are composed of two metals that generate an electrical voltage or resistance when a temperature change occurs by measuring the voltage across the diode terminals. When the voltage increases, the temperature also increases.

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Temperature sensors work by providing readings via electrical signals. Sensors are composed of two metals that generate an electrical voltage or resistance when a temperature change occurs by measuring the voltage across the diode terminals. When the voltage increases, the temperature also increases.

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"A proximity sensor is a sensor which detects the presence of nearby objects without any physical contact. This can be done using the electromagnetic field or electromagnetic radiation beam in which the field or return signal changes in the event of the presence of any object in its surrounding."

There is usually a proximity senor on most mobile phones. "The proximity sensor turns off the touch screen during voice calls when your ear is close to the screen. This prevents you from unintentionally activating other functions on your device when you are engaged in a call. The proximity sensor is located on the upper front part of the phone (above the display)."

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"A pressure sensor has a measuring cell that converts (or transduces) the mechanical strain of the pressure applied and converts the force into an electrical signal. Pressure in a pipe, hose, or duct applies force on the measuring cell of a sensor, causing a deflection which is measured by an electrical circuit."

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"The pulse oximeter uses a cold light source that shines a light through the fingertip, making the tip appear to be red. By analysing the light from the light source that passes through the finger, the device is able to determine the percentage of oxygen in the red blood cell."

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"Typically, blood pressure monitors work by inflating a cuff until it temporarily cuts off blood flow through the brachial artery. The pressure in the cuff is then slowly released. Within the cuff, a sensor detects blood flow."

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"Heart rate monitors work by measuring electrical signals from your heart. They are transmitted to a wristwatch or data centre. Many models let you analyse data via a computer and having that data allows you to interpret your workout and better understand the benefits from your exercise."

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"Augmented reality starts with a camera-equipped device—such as a smartphone, a tablet, or smart glasses—loaded with AR software. When a user points the device and looks at an object, the software recognizes it through computer vision technology, which analyses the video stream."

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"There are stereoscopic lenses positioned between the screen and your eyes that distort the image into appearing three-dimensional. Two images are passed through the lens, one for each eye, similar to how our eyes perceive and process visuals in the real world."

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"Tomographic motion sensors are made up of multiple nodes. The nodes link together, forming a mesh network. These sensors detect the presence of a person or object when the link between two nodes is broken. Vibration motion sensors detect people and objects via small vibrations caused by things like footsteps."

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Gyroscope - rotational orientation (auto rotate screen/games using tilt control)

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Gyroscope - rotational orientation (auto rotate screen/games using tilt control)

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"A mechanical gyroscope essentially consists of a spinning mass that rotates around its axis. In particular, when the mass is rotating on its axis, it tends to remain parallel to itself and to oppose any attempt to change its orientation."

"Modern smartphones use a kind of gyroscope that consists of a tiny vibrating plate on a chip. When the phone's orientation changes, that vibrating plate gets pushed around by the Coriolis forces that affect objects in motion when they rotate."

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"In general, slow motion video works by shooting at a high frames per second (fps) rate and then playing it back at a much slower rate. This creates interesting videos where the action is slowed way down. With the Super Slow-mo feature, the action is shot at 960 fps, which is four times faster than regular slow motion."

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"A 3D camera is an imaging device that enables the perception of depth in images to replicate three dimensions as experienced through human binocular vision. Some 3D cameras use two or more lenses to record multiple points of view, while others use a single lens that shifts its position."

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"Infrared Red or night vision cameras use infrared light to illuminate images in the dark. We can't see it, but infrared light is actually all around us. Infrared Red cameras detect these invisible infrared wavelengths, enabling the camera to see in the dark."

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"A camera lens takes all the light rays bouncing around and uses glass to redirect them to a single point, creating a sharp image. When all of those light rays meet back together on a digital camera sensor or a piece of film, they create a sharp image."

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GPS - location positioning and navigation

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GPS - location positioning and navigation

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"Global Positioning System (GPS) is a system of 30+ navigation satellites circling Earth. We know where they are because they constantly send out signals. A GPS receiver in your phone listens for these signals. Once the receiver calculates its distance from four or more GPS satellites, it can figure out where you are."

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"An accelerometer works using an electromechanical sensor that is designed to measure either static or dynamic acceleration. Static acceleration is the constant force acting on a body, like gravity or friction. These forces are predictable and uniform to a large extend."

"The accelerometer is an in-built comment of a smartphone to measure its acceleration. It tracks the different motion like shaking, tilting, swinging, and rotating and accordingly change the orientation of your app. To calculate and detect the motion, the accelerometer uses the value of XYZ."

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"Palm print recognition systems use a scanning device or a camera-based application, along with associated software that processes image data from a photograph of an individual's palm and compares it to a stored record for that person. Palm prints are counterparts to fingerprints, including similar details."

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"Speech recognition software works by breaking down the audio of a speech recording into individual sounds, analysing each sound, using algorithms to find the most probable word fit in that language, and transcribing those sounds into text."

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"A capacitive fingerprint sensor uses a grid of tiny capacitors that store electricity, which is discharged only at the points where your fingerprint ridges touch. An array of thousands of capacitors can then be used to map the pattern of your fingerprint. Sometimes these sensors also support swipes or force sensing."

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"Biometric iris recognition scanners work by illuminating the iris with invisible infrared light to pick up unique patterns that are not visible to the naked eye. Iris scanners detect and exclude eyelashes, eyelids, and specular reflections that typically block parts of the iris."

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"Face recognition systems use computer algorithms to pick out specific, distinctive details about a person's face. These details, such as distance between the eyes or shape of the chin, are then converted into a mathematical representation and compared to data on other faces collected in a face recognition database."

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"A microphone converts sound into a small electrical current. Sound waves hit a diaphragm that vibrates, moving a magnet near a coil. In some designs, the coil moves within a magnet."

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"Speakers work by converting electrical energy into mechanical energy (motion). The mechanical energy compresses air and converts the motion into sound energy or sound pressure level (SPL). When an electric current is sent through a coil of wire, it induces a magnetic field."