Computer Science · May / June 2021 · Paper 11 · Question 5
0478
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The question as text
Jamelia has a greenhouse that she uses to grow fruit and vegetables. She needs to make sure the temperature in the greenhouse stays between 25 °C and 30 °C (inclusive). A system that has a temperature sensor and a microprocessor is used to maintain the temperature in the greenhouse. The system will: • open a window and turn a heater off if it gets too hot • close a window and turn a heater on if it gets too cold. Describe how the system uses the temperature sensor and the microprocessor to maintain the te [8]
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Sensor send data/readings/signal to microprocessor
Data is converted from analogue to digital (using ADC)
Microprocessor compares/checks data to stored values/range of values
… If data is greater than 30 / above the range microprocessor sends signal to open window and to turn heater off
… If data is below 25 the microprocessor sends signal to turn on heater and to close window
… If data is between 25 and 30 / within the range no action taken
Actuator is used to operate heater/window
Whole process is continuous
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