Embedded Systems (Cambridge (CIE) O Level Computer Science)
Revision Note
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Author
James WoodhouseExpertise
Computer Science
Embedded Systems
What is an embedded system?
An embedded system is a computer system which is used to perform a dedicated function, inside a larger mechanical unit
Examples of embedded systems include
Heating thermostats
Hospital equipment
Washing machines
Dishwashers
Coffee machines
Satellite navigation systems
Factory equipment
Security systems
Traffic lights
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What are the properties of an embedded system?
They are small in size
They use less power than a general-purpose computer
They have a lower cost
Exam Tip
Always use key examples from the list above and don’t try to use different examples such as a fridge or kettle as these will not appear on mark schemes because although they have a single purpose, most fridges and kettles do not have a CPU.
Worked Example
1) Tick two boxes below to show which are an example of an embedded system
[2]
| Is it an example of an embedded system |
Laptop |
|
Washing Machine |
|
Mobile Phone |
|
Car Engine Management System |
|
2) Justify your choice to question 1
[2]
Answers
1) Tick two boxes below to show which are an example of an embedded system. [2]
| Is it an example of an embedded system |
Laptop |
|
Washing Machine | ✓ |
Mobile Phone |
|
Car Engine Management System | ✓ |
2) Justify your choice to question 1 [2]
Any two of:
A washing machine and car engine management system are not general-purpose computers [1]
A washing machine and car engine management system have a single purpose and are both housed inside a larger mechanical unit [1]
A washing machine and car engine management system have a microprocessor [1]
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