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Computer Science · Oct / Nov 2023 · Paper 12 · Question 7

0478

As printed in the paper

The question as text

A train station has a ticket inspector who checks each customer’s ticket before they are allowed to get on the train. The train station wants a system that will allow the tickets to be automatically checked.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 7(a)[2]

    Any two from e.g.

    Barcode scanner
    QR code scanner
    Digital camera

  • 7(b)[6]

    Any six from:

    Proximity/infrared/pressure sensor used
    Sensor continually sends digitised data to microprocessor // When driver pushes button, sensor sends digitised data to the microprocessor
    Microprocessor compares data to stored value(s)
    If in range/out of range/matches, microprocessor sends signal to close the door
    Actuator used to close door
    If not in range/out of range/does not match door will not close // If not in range/out of range/does not match actuator not activated/signal not sent as passenger in door //

    If not in range/out of range/does not match a timer is set to check again // If not in range/out of range/does not match a signal is sent to alert the driver/output a message

    This process repeats until the door can close
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