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Computer Science IGCSEPDF 70
142 pagesrevision 46930
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pH sensor
Example:
● Iftemperature < 20°C → heater ON
● Iftemperature > 25°C → heater OFF
Measures acidity/alkalinity
Function:
Acts as the brain of the system, processing sensor data and making decisions using
pre-programmed instructions.
Tasks:
●
Compare input data with thresholds
●
Send signals to actuators
●
Store or log data
●
Use feedback for adjustments
Function:
Actuators carry out actions based on computer signals, converting electrical energy into
movement or other effects.
Common Actuators:
3. Output Devices (Actuators)
2. Processing (Microprocessor / Microcontroller)
Actuator
Function
Example