O-LevelComputer ScienceAutomated and emerging technologies2210/11 · May/June 2021 · Q58 Marks
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 temperature in the greenhouse.
- (a)Describe how the system uses the temperature sensor and the microprocessor to maintain the temperature in the greenhouse.[8]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [8] (a) Eight from: 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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