A greenhouse uses a microprocessor-controlled... | Information and Communication Technology (9-1) 0983 | Paper 1 Mock 21 | Theory

Question 1 Report

A greenhouse uses a microprocessor-controlled environment system.

(a) Describe how the microprocessor uses the temperature sensor and heater to maintain the correct temperature. [3]

(b) Explain how the light sensor and window motor work together to control light levels. [3]

Answer

Answer Details

(a) How the microprocessor uses the temperature sensor and heater to maintain the correct temperature:

The temperature sensor continuously measures the temperature inside the greenhouse and sends this data to the microprocessor. [1]
The microprocessor compares the current temperature reading with the pre-set target temperature stored in its memory. [1]
If the temperature is below the target, the microprocessor sends a signal to turn the heater on. If it is at or above the target, it signals the heater to turn off. This feedback loop repeats continuously to maintain the desired growing conditions. [1]

(b) How the light sensor and window motor work together to control light levels:

The light sensor measures the light intensity inside the greenhouse and sends the reading to the microprocessor. [1]
The microprocessor compares the current light level with the pre-set required level stored in memory. [1]
If the light level is too high, the microprocessor signals the window motor to close blinds or shutters to reduce the light. If the level is too low, it signals the motor to open them to allow more sunlight in. [1]

A greenhouse uses a microprocessor-controlled environment system. (a) Describe how the microprocessor uses the temperature sensor and heater to maintain the...