Barcode Scanner - The scanning head shoots a laser that scans the black and white area of a barcode

• The light is reflected back into a photoelectric reader

Black areas reflect less light back while white areas reflect more. The amount of light reflected back determines the light level and a binary code is assigned. This is done in the processor.The binary code is sent to the computer which can relay information back depending on the software. 

• scanning goods at a supermarket checkout

• checking library books in and out

• tracking packages for delivery

It is required to make things faster, helps to reduce errors of manual  input,

If barcodes are damaged chance they won't work 

If there are internal issues it can break

Digital Camera - Modern digital cameras link to a computer via a USB port or by using Bluetooth. As light enters the camera, it falls onto a sensor made up of millions of squares known as pixels. Each pixel measures the light intensity and a microprocessor converts these values into digital data representing colour values. 

• Photography 

• Convenient

• Operating Costs are low

• High Price

• Requires power source

Keyboard - Enters characters and functions into the computer system by pressing buttons or keys

• Writing an email

.

• Can type quickly

• Relatively Cheap

• Disable people find them difficult to use

Optical Mouse - Uses light to detect movement instead of a ball

• Clicking and Selecting

• Easy to learn 

• Scrolling easier

• Cause hand pain

Resistive Touch Screen - It works by sensing direct pressure from the user and activated by other equipment as it detects pressure

• ATM Machine

• Has more resolutions

• It needs more pressure

Capacitive Touch Screen - Requires a conductive material such as finger and once it is applied an electrical charge is sent to the device on the point of contact

• Tablets 

• Ipads

• Easy to use

• High cost

• Prone to accidental touches

Moving Coil Microphone - Sound Waves vibrate diaphragm which is attached to a coil which move against a permanent magnet and causes a domino effect with the electrons in the mic cable which goes to a preamp which amplifies the sound so it can be used by other gear

On Stages

Recording stuff

Its cheaper and more rugged than the condenser microphone

It doesn't require any external power

It's not as sensitive or high quality sound as the condenser microphone

QR Reader - QR codes are typically used to provide a link to a particular page on a website, or to provide a link to an email or app that holds, for example, purchase details for concert tickets or travel information such as train times and seat numbers for a journey. QR stands for quick response. A QR code can store up to 7,089 numbers or 4,296 characters. Because of the higher storage capacity, some businesses are using QR codes to replace barcodes in their business systems. QR code scanners do not use lasers, the codes are captured and read by taking an image of the QR code, either with a dedicated scanner, or by using a camera and app on a mobile device.

QR Code Pay

Quick

 Easy to Operate

Sometimes hard to read

2D Scanners - 2D or flatbed scanners shine a bright line across a document to measure the levels of reflected light and create a digital version of it. Typically used for creating digital versions of documents and photographs and reading passports at airports.

Airports with Passports 

3D Scanners- 3D scanners shine a laser over the surface of an object to record its geometry and dimensions and create a digital  model of it by building up a series of very thin slices. Typically used for creating 3D models to use with CAD or creating replicas. Biometric devices including CT and MRI scans, airport security and also in fields such as dentistry, product development and research.