Output devices and printers

It carries out physical movements

Opening and closing an automatic door Turning a wheel Operating an aircraft’s wing flaps

Used with sensors to control many kinds of mechanisms Translates digital signals into movement of physical objects

Digital Light Processing projector

It is a matrix of millions of micro-mirrors on a small microchip White light is shone through a rotating colour filter to produce an image

Projecting a computer output onto a wall/whiteboard

• Higher contrast and definition • Smoother video quality • Smaller, lighter and more portable

Three mirror filters separate an image into red, blue and green wavelengths The three images are then combined to produce one full-colour image

Projecting a computer output onto a wall/whiteboard

• Cheaper • Quieter • Less power and heat output

Tiny droplets of ink are forced through a fine nozzle onto a sheet of paper

Small-scale print jobs High-quality professional photos

They are small and compact They are excellent for high-quality colour photos

Paper can be damp/wrinkle after printing

• The printer generates a mirror image of the printed page and draws the image onto a drum using a laser (creates negative charged areas) • Toner (powdered, positively electrostatic ink) is attracted to the drum • The toner is transferred to the paper and bonded using a heat roller

Fast and accurate for black and white documents Lower running costs per page

Colour printers and toner cartridges are expensive

A digital signal is sent through a DAC (digital to analogue converter) and then passed on to a speaker to create sound

It deposits laters of materials on top of each other to slowly build a 3D object

Inexpensive prosthetics Spare parts Rapid prototyping

Allows us to produce real-world models of virtual objects created using CAD software Can be used to design products that are more easily repairable