input devices

Question 1

which is example of an I/O device

Answer 1

touchscreen

Question 2

2 common type of barcode system

Answer 2

UPC-A
used in retail and warehousing

Code 128
used in transport and shipment packing

Question 3

what can UPC-A and Code 128 represent

Answer 3

code 128 - letters and nums

UPC-A - only nums

Question 4

QR codes

Answer 4

2d barcodes
can be read by smartpohnes and tablets

Question 5

use of 2D scanner

Answer 5

convert hard copy of document to computer readable format

Question 6

3d scanners

Answer 6

used in industry and medicine
rely on a tech called tomography which is splitting the image into very small pieces

Question 7

Sensors

Answer 7

collect data in analogue form
conver to digital data to be processed

sensors used in monitoring and control apps

Question 8

def sensor

Answer 8

hardware device that can take measurement of physical properties from real world surroundings. these measurements usually a representation of actual property being measured

Question 9

analogue def

Answer 9

no disrete value - data changes smoothly

Question 10

monitoring sensor

Answer 10

comp makes no changes to actual process - just reports the values

Question 11

control sensor

Answer 11

output from comp can alter the process and affect the next input recieved

Question 12

sensor feedback

Answer 12

sensor constantly takes readings
if readings exceed pre set values, signal is sent
each sensor feeds into interface box so microprocessor can pinpoint exactly which sensor sent the signal
monitoring continues until system deactivated