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Input/output

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Question 6

An automated greenhouse system controls the environment using sensors and actuators. The following algorithm is designed to regulate the climate conditions:

1
2  WHILE (systemActive = True) DO
3
4      RECEIVE value FROM SENSOR_TEMP
5      IF (tempValue < 18) THEN
6          SET heaterStatus TO "On"
7      END IF
8
9      RECEIVE value FROM SENSOR_MOIST
10     IF (moistureValue < 40) THEN
11         SET irrigatorStatus TO "On"
12     END IF
13
14     RECEIVE value FROM SENSOR_LIGHT
15     IF (lightValue < 200) THEN
16         SET lampStatus TO "On"
17     END IF
18
19     IF (tempValue >= 18) THEN
20         SET heaterStatus TO "Off"
21     END IF
22
23     IF (moistureValue >= 40) THEN
24         SET irrigatorStatus TO "Off"
25     END IF
26
27     IF (lightValue >= 200) THEN
28         SET lampStatus TO "Off"
29     END IF
30
31 END WHILE

State the name of the input device in the algorithm used to control the irrigation system (irrigator).

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Markscheme

Input/output Questions

  1. GCSE
  2. /Computer Science
  3. /Input/output

25 exam-style questions on Edexcel GCSE Computer Science Input/output, covering Accepting and responding to user input, Reading and writing CSV text files, Implementing validation, and Implementing authentication. Each one has a worked solution and a mark scheme showing where the marks go.

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