Embedded Systems (Cambridge (CIE) O Level Computer Science)
Revision Note
Written by: James Woodhouse
Reviewed by: Lucy Kirkham
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
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
Examiner Tips and Tricks
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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