GCSE Edexcel Computer Science Additional Programming Techniques: The airport has touchless handwa

Question

The airport has touchless handwashing stations. The stations automatically dispense soap, water and warm air for drying. To conserve water, the stations must ensure that only one operation is carried out at a time.

Here is the algorithm for controlling the handwashing stations.

WHILE (powerStatus = True) DO
    RECEIVE TrueFalse FROM SENSOR_S
    IF (soapRequest = True) THEN
        SET soapStatus TO "on"
    END IF

RECEIVE TrueFalse FROM SENSOR_W
    IF (waterRequest = True) THEN
        SET waterStatus TO "on"
    END IF

RECEIVE TrueFalse FROM SENSOR_D
    IF (dryerRequest = True) THEN
        SET dryerStatus TO "on"
    END IF

IF (soapRequest = False) THEN
        SET soapStatus TO "off"
    END IF

IF (waterRequest = False) THEN
        SET waterStatus TO "off"
    END IF

IF (dryerRequest = False) THEN
        SET dryerStatus TO "off"
    END IF
    END WHILE

The airport has touchless handwashing stations - Edexcel - GCSE Computer Science - Question 3 - 2020 - Paper 1

Worked Solution & Example Answer:The airport has touchless handwashing stations - Edexcel - GCSE Computer Science - Question 3 - 2020 - Paper 1

3a) Identify the sensor for water

3b) Describe the limitation of the algorithm

3c) Correct the control statement for soap

3d) Explain the use of AND and NOT in logical operations

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