Zusammenfassung der Ressource
Data Capture Methods - Cambridge
Nationals ICT
- Barcode Readers
- Read barcodes attached to products
- Accompanied by a 13-digit number
- Read by a laser
- Applications
- Supermarkets
- Libraries
- Advantages
- Fast method of input
- Disadvantages
- Needs specialised equipment
- Easily damaged - can be hard to read
- Must be in sight of reader
- Paper-Based Forms
- Advantages
- Can be posted for completion
- Can be handed physically to recipients
- Disadvantages
- Not environmentally friendly
- Slow to process
- May not be returned
- Inefficient
- Errors may not be immediately detected,
which could affect data validity
- Online forms
- Features
- Radio button
- Select one item from a list of
options - only one can be selected
- Text field
- Enter unique data
- e.g. Postcode
- Drop-down list
- Select one item from a predetermined list
- Tick box
- Choose one or more
options from a range
- Control System Sensors
- E.g. Heat, light and moisture sensors
- Measure data, then use an ADC to
convert analogue to digital signals
- Processed data fed back into the
system for control is called feedback
- Applications
- Monitoring greenhouse temperature
- Weather data
- Traffic control
- Advantages
- Can capture physical quantities
- Accurate recording
- Disadvantages
- Equipment cost
- Requires specialist software
- RFID Tags
- Applications
- Payment systems
- Supply chain efficiency
- Military goods tracking
- Advantages
- Tag does not need to be in sight of the reader
- Location known at all times
- Disadvantages
- Needs specialist equipment
- Near-Field Communication (NFC)
- Applications
- Contactless transactions
- Data exchange at close quarters
- Advantages
- Simple to set up
- Low speed connection
- Disadvantages
- Devices must be close together