1.4 Input devices
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Give some examples of input devices
• Keyboards • Pointing • Microphones • Touch screens • Interactive whiteboards
Pointing devices
Things like mouse and trackerball
Types of barcode systems
• Universal Product Code • Code 128
UPC-A
• Retail and warehousing • Represent numeric digits
Code 128
• Used in transport and shipment tracking • Can represent letters and numbers
QR
2D barcodes and can be read by smartphones and tablets
Uses of QR codes in society
• Restaurant coupons • Mobile concert tickets • Real estate agency boards • Business cards • Tourist information • Advertising posters
2D scanners
Used to convert a hard/paper copy document or photograph into a computer-readable product
3D face recognition
Security cameras may use face recognition
3D scanners
Used in both industrial and medical fields
Tomography
Image something in very thin slices
Sensors
• Collect data in an analogue form and require conversion to digital data to be processed • Take measurements of physical properties such as temperature or pressure from real world surroundings, which usually is a representation of the actual property being measures
Analogue measurements
Data has no discrete value
Types of sensors
• Gas • Infra-red • Light • Temperature • Pressure -pH • Magnetic Field • Moisture/humidity • Acoustic
Monitoring
Makes no changes to the actual process, it will simply report the values