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← 1.3 Input/Output (I/O) Devices

Barcodes, QR codes and paying by scan

Computer Studies · Grade 10 · about 40 minutes

One-dimensional barcodes against two-dimensional QR codes, what a till actually looks up, and the three habits that stop sticker fraud on Kenyan payment signs.

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  • 8 sections of explanation, worked examples and diagrams
  • 1 practice task with hints and worked answers
  • A quiz that marks itself as you go
  • Your progress kept across every subject you take
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Other lessons in this sub-strand

  1. Input devices and how they work
  2. Output devices, and how to choose input and output equipment
  3. The keyboard: scan codes, layouts and keypads
  4. Pointing devices: mice, pads and digitisers
  5. Scanners, OMR, OCR and MICR
  6. RFID, biometrics and card readers
  7. Touch screens: resistive, capacitive and infrared
  8. Barcodes, QR codes and paying by scan
  9. Voice, cameras and sensors
  10. Monitors: LCD, OLED and the numbers on the box
  11. Printers, plotters and cost per page
  12. Choosing devices, visiting a workplace, and e-waste