Common uses of input and output devices
A burglar alarm
Sensor constantly monitor the conditions within a building, feeding back data to a microprocessor. If the sensor detects the movement or warm body of a potential burglar moving through the building then the alarm will activated itself by the microprocessor, triggering lights and buzzers.
Input devices: sensors, a keypad(to set the alarm), remote control.
Output devices:buzzers, bells, lights.
Shopping using a debit or credit card
When you buy an item in most shops, a barcode scanner inputs the item’s product code into the computer system. The product code us used to find the price of the product in the stock database and the price is shown on the till display. A card payment is made, using the chip and PIN system or a magnetic stripe reader, and money is transferred electronically from the consumer to the shop’s account. The item is then removed from the stock database and a receipt is printed.
Input devices:till keypad
Direct data entry device: barcode scanner, Chip and PIN or magnetic card reader, RFID reader.
Output devices: receipt printer, till LCD display, buzzer.
IGCSE ICT 