input, output

Question 1

The 4 types of barcode readers

Answer 1

• pen-type
• laser scanners
• CCD readers
• camera based readers

Question 2

+&- of pen-type readers

Answer 2

+ durable, can be tightly sealed against dust, dirt, and other environmental hazards
+ small size, low weight, good for portable or low volume devices
- must come into direct contact with a barcode to read it

Question 3

where and why laser scanners are used

Answer 3

• in-counter units in supermarkets
• reliable and economical for low-volume applications

Question 4

+&- of digital cameras

Answer 4

+ higher quality images and used in higher end cameras
+more reliable as tech has been around for longer
- uses lots of power consumption

Question 5

What is RFID

Answer 5

Radio Frequency Identification,
- input from device that reads signal from RFID chip
- output to transmit a signal from an active tag

Question 6

LCD

Answer 6

Liquid crystal display
+ reach max brightness immediately
+image is sharper, more realistic and vivid
+ brighter light = better picture definition
+LEDs are small, screen can be thin
+last a while = more reliable
+ consume little power, little heat, reduce running costs

Question 7

OLED

Question 8

Laser printer

Question 9

Inkjet printer

Question 10

Dot matrix printer

Question 11

3D printer

Question 12

Actuator