O-LevelComputer ScienceAutomated and emerging technologies2210/12 · Oct/Nov 2022 · Q29 Marks
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.
- (a)Explain how the water tap system uses a sensor and a microprocessor to operate.[6]
- (b)Three descriptions are shown of different systems. Identify the most suitable sensor that could be used in each system. Description of system it checks the air is dry enough in a garage that spray paints cars it automatically switches on the headlights on a car when it is dark it checks that the soil in a greenhouse has the correct level of acidity[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.
- [6] 2(a) Six from: Motion/proximity/infra-red sensor is used // Sensor sends data to microprocessor // Data 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 on // If data is outside range /inside range/less than/greater than, tap remains off / signal is sent to turn water tap off // Actuator is used to turn the tap off/on // Whole process is continuous
- [3] 2(b) One mark for each correct sensor // Moisture/humidity // Light // pH
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →