An automatic car park barrier uses a... | Information and Communication Technology 0417 | Paper 1 Mock 01 | Theory

Question 1 Report

An automatic car park barrier uses a computer-controlled system. The diagram shows the components.

(a) Describe the sequence of events when a car approaches the barrier to enter the car park. [4]

(b) Identify two sensors that could be used in this system. [2]

Answer

Answer Details

(a) Sequence of events when a car approaches the barrier:

A sensor (such as a pressure pad or proximity sensor) detects the approaching car and sends a signal to the processor. [1]
The processor checks the system's data to determine whether parking spaces are available in the car park. [1]
If spaces are available, the processor sends a signal to the barrier motor (actuator) to raise the barrier, allowing the car to enter. [1]
A ticket is issued to the driver, and the display is updated to show the revised number of available spaces (decremented by one). [1]

(b) Two sensors that could be used in this system:

Pressure sensor, embedded in the road surface at the barrier approach, which detects the weight of a car driving over it. [1]
Infrared or proximity sensor, which detects the presence of a car approaching the barrier by sensing the break in an infrared beam or the proximity of a large object. [1]

An automatic car park barrier uses a computer-controlled system. The diagram shows the components. (a) Describe the sequence of events when a car approaches...