Computer Science · Oct / Nov 2021 · Paper 11 · Question 9
0478
As printed in the paper
The question as text
A washing machine uses sensors and a microprocessor to control the washing cycle of clothes.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
9(a)[3]
One mark per each correct sensor.
Task
Sensor checking the water is 30 °C
Temperature checking the water acidity level after detergent is
pH
added
checking the weight of the clothes to make sure that
Pressure the machine is not overloaded
9(b)[6]
Six from:
Sensor sends data to microprocessorData is converted from analogue to digital (using ADC)Data is compared to stored value (of 30)If data is below 30 then a microprocessor sends signal is sent to a heater to heat the water up/add hot water
if data is above 30 then a microprocessor sends signal is sent to turn the heater off to allow the water to cool down/add cold waterActuator used to turn headset on/off // Actuator used to add waterIf data is 30 then no action is takenIt is a continuous process
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