OCR · GCSE · Computer Science
Course version: J277 · Version from Sept 2022
Embedded systems: Examples of embedded systems
Embedded systems appear in many everyday products, each dedicated to controlling its host device.
Checked against the OCR J277 specification on .
- Point 2 of 2
- 4 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
Embedded systems appear in many everyday products, each dedicated to controlling its host device. A washing machine controller reads water-level and temperature sensors and drives valves and a motor. A car engine management unit adjusts fuel injection from sensor data. A microwave oven controller runs a timer and door interlock. Other examples include central heating thermostats, digital cameras, fitness trackers, traffic lights, pacemakers and domestic routers. In each case the computer is hidden inside the product, runs fixed firmware and performs one control job. Recognising the input, the processing and the output for a named example shows that you understand the concept rather than just memorising a list.
What earns the marks
- Gives a valid named example such as a washing machine, microwave, car engine management unit, thermostat, digital camera or traffic light controller.
- For a chosen example, identifies the sensors or inputs, such as temperature, light, pressure or user buttons.
- For a chosen example, identifies the outputs or actuators, such as motors, heaters, valves, displays or buzzers.
- Explains that the embedded computer processes the input according to fixed firmware and produces the control output.
- Recognises that the same device may contain several embedded systems, for example a car with engine, braking and entertainment controllers.
Common mistakes and how to put them right
Choosing a general-purpose device such as a laptop or smartphone as the example.
Put it right: , use a device whose computer is dedicated to controlling that product, such as a washing machine.
Listing a device without explaining what the embedded computer controls.
Put it right: , always state the input, the processing and the output.
Assuming every electronic product contains an embedded system.
Put it right: , a simple device with no programmable control, such as a basic torch, may contain no computer at all.
Exam tips
- Prepare two or three detailed examples you can describe fully, rather than many shallow ones.
- Use the input–process–output pattern to structure your answer and make the control role clear.
- If asked for several examples, give brief but distinct devices and avoid repeating the same category.
Try the lesson
The start of the Embedded systems: Examples of embedded systems lesson, made from checked teaching notes for this specification point.
Have a go first
Which of these is an example of an embedded system?
Listen
Embedded systems appear in many everyday products, each dedicated to controlling its host device. A washing machine controller reads water-level and temperature sensors and drives valves and a motor. A car engine management unit adjusts fuel injection from sensor data. A microwave oven controller runs a timer and door interlock. Other examples include central heating thermostats, digital cameras, fitness trackers, traffic lights, pacemakers and domestic routers. In each case the computer is hidden inside the product, runs fixed firmware and performs one control job. Recognising the input, the processing and the output for a named example shows that you understand the concept rather than just memorising a list. A strong answer earns marks for these points. Gives a valid named example such as a washing machine, microwave, car engine management unit, thermostat, digital camera or traffic light controller. For a chosen example, identifies the sensors or inputs, such as temperature, light, pressure or user buttons. For a chosen example, identifies the outputs or actuators, such as motors, heaters, valves, displays or buzzers. Explains that the embedded computer processes the input according to fixed firmware and produces the control output. A common slip: Choosing a general-purpose device such as a laptop or smartphone as the example. Instead, , use a device whose computer is dedicated to controlling that product, such as a washing machine. Exam tip: Prepare two or three detailed examples you can describe fully, rather than many shallow ones.
Key words
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Everyday control devices
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Sensors and actuators
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Fixed firmware
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Input–process–output
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See every definition
- Everyday control devices
- Products such as washing machines, microwave ovens, central heating thermostats, digital cameras, fitness trackers, traffic lights, pacemakers and domestic routers, each containing a computer dedicated to controlling its host device.
- Sensors and actuators
- The inputs a controller reads, such as water-level and temperature sensors, and the outputs it drives, such as valves and a motor.
- Fixed firmware
- The software an embedded computer runs to perform one control job, processing the input and producing the control output.
- Input–process–output
- The pattern used to structure an answer, identifying the input, the processing and the output for a named example to show understanding of the concept.
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