O-LevelComputer ScienceAutomated and emerging technologies2210/12 · Oct/Nov 2023 · Q78 Marks
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.
- (a)Identify two suitable input devices that can be used to automatically read the tickets. 1 2[2]
- (b)The train driver pushes a button to close the train door when all passengers have boarded the train. The train door will only close when there are no passengers in the doorway. The system to check there are no passengers in the doorway uses a sensor and a microprocessor. Explain how the sensor and the microprocessor are used to check whether the train door can be closed.[6]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.
- [2] Any two from e.g. // Barcode scanner // QR code scanner // Digital camera
- [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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