a series of dark and light lines of varying thickness used to represent data; the code has to be scanned using laser or LED light source
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quick response (QR) code
a matrix of dark and light squares which represent data; the pattern can be read and interpreted using a smartphone camera and QR app
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3
frame QR code
a type of QR code that includes a space for advertising
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4
DAC (digital to analogue converter)
a device that converts digital data into electric currents that can drive motors, actuators and relays, for exmaple
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ADC (analogue to digital converter)
a device that converts analogue data (for example, data read from sensors) into a form understood by a computer
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6
charge couple device (CCD)
a light sensitive cell made up of millions of tiny sensors acting as photodiodes
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virtual keyboard
an onscreen keybaord which uses the features of the touch screen to emulate a physical keyboard
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8
touch screen
a screen that allows the user to select or manipulate a screen image using the touch of a finger or stylus; touch screens most frequently use capacitive, infra-red or resitive technology
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optical mouse
a pointing device that uses a red LED to track the movement of the device and then relays its coordinates to a computer
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pointing device
an input deivce that allows the user to control the movement of an onscreen cursor or to allow onscreen selection by clicking a button on the device
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11
computer aided design (CAD)
software used to create drawings
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12
computer tomographic (CT) scanner
technology than can creat ea 3D image of a solid object by slicing up the object into thin layers
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capacitive touch screen
a type of touch screen that uses the change in the screen's capacitance (the ability to store an electrical charge) when it is touched by a finger or stylus
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14
infra-red touch screen
a type of touch screen that uses infra-red beams and sensors to detect where the screen has been touched
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resisitive touch screen
a type of touch screen that uses two conductive layers which make contact where the screen has been touched
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16
actuator
an output device that converts electrical energy into mehcanical movement
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digitala micromirror device (DMD)
a chip that uses millions of tiny mirrors on its surface to create a video display
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18
thermal bubble
inkjet printer technology whereby tiny resistors create heat and form an ink bubble which is ejected onto paper in an inkjet printer
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piezoelectric
a crystal located in an ink reservoir within an inkjet printer; the crystal vibrates and forces ink out onto the paper
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20
direct 3D printing
a 3D printing technique in which the print head moves in the x, y and z directions
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binder 3D printing
a 3D printing method that uses a two-stage pass; the first stage uses dry powder and second stage uses a binding agent
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22
organic LED (OLED)
a light-emitting diode that uses the movement of electrons between a cathode an anode to produce an on-screen image; it generates its own light so no backlighting is required
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loudspeaker
an output device that converts electric current into sound
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