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Closed-loop control of an aquarium heater
5 marksYou mark it yourself against the marking points
A school's tropical fish tank must stay at 26 °C. A temperature probe sits in the water. A small microcontroller reads the probe every 10 seconds and switches an electric heater on or off.
(a) Identify the sensor, the processor and the actuator in this system. [3]
(b) Explain how feedback keeps the water close to 26 °C. [2]
[5]