Computer Science · Oct / Nov 2022 · Paper 12 · Question 2
0478
As printed in the paper
The question as text
An automated water tap system uses a sensor and a microprocessor to operate. Water flows from the tap when a person’s hands are placed underneath the tap. Water stops flowing when the person’s hands are removed from underneath the tap.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
2(a)[6]
Six from:
Motion/proximity/infra-red sensor is usedSensor sends data to microprocessorData is converted from analogue to digital (using ADC)Data is compared to stored/set value(s)If data is inside range/outside range/greater than/less than, signal is sent to turn water tap onIf data is outside range /inside range/less than/greater than, tap remains off / signal is sent to turn water tap offActuator is used to turn the tap off/onWhole process is continuous2(b)[3]
One mark for each correct sensor
Description of system
Sensor
it checks the air is dry enough in a garage that spray paints
Moisture/humidity
cars
it automatically switches on the headlights on a car when it is
Light
dark
it checks that the soil in a greenhouse has the correct level of
pH
acidity
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