Embedded system

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Quick Questions

Shade in the A or B circle for each question.

1. Which statement describes an embedded system?

A A computer system built into a device to do one dedicated function

B A computer system designed to run many different applications

2. Which device contains an embedded system?

A A wooden chair

B A microwave oven with a timer controller

3. An embedded system is usually...

A A separate computer that the user installs software on

B Built into a larger device

4. What kind of program does an embedded system usually run?

A A fixed program that rarely changes

B Any program the user chooses to download

5. How many main tasks does an embedded system normally perform?

A One dedicated function

B Many different general tasks

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1embedded system		Awashing_machine_controller = run("wash_program")
2microwave timer controller		BAn embedded system has one dedicated function and usually a fixed program. Running any software the user installs describes a general-purpose computer.
3An embedded system has a dedicated function and usually runs a fixed program stored in the device		CAn embedded system is built into a larger device, not a separate stand-alone computer like a desktop.
4An embedded system is built into a larger device and is usually small and low cost		Ddevice = Thermostat(embedded_chip = True)
5embedded_system = runs_any_software_the_user_installs		EAn embedded system inside a microwave that only controls the cooking time and power
6embedded_system = separate_desktop_computer		FA computer system built into a larger device to perform one dedicated function, usually running a fixed program

Definitions

embedded system

Fill in the Blanks

Complete each line of code by filling in the missing parts.

A microwave timer is an _______________

An embedded system is __________ a device

Most embedded systems run a _____ program

Embedded systems have one _________ function

Embedded systems are small and ___ cost

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A time ← 30

B WHILE time < 0

C time ← time - 1

D ENDWHILE

E buzzer ← ON

Question 2

A INPUT temp FROM sensor

B IF temp < 40 THEN

C heater ON

D ENDIF

Question 3

A REPEAT

B INPUT temp FROM sensor

C IF temp > 25

D fan ← ON

E ENDIF

F UNTIL FALSE

Question 4

A WHILE TRUE

B INPUT door FROM sensor

C IF door = OPEN THEN

D siren ← OFF

E ENDIF

F ENDWHILE

Question 5

A // Program is rewritten daily

B WHILE power = ON

C RUN wash_program

D ENDWHILE

Answer Key

Embedded system

Section A: Quick Questions

A — A computer system built into a device to do one dedicated function

B — A microwave oven with a timer controller

B — Built into a larger device

A — A fixed program that rarely changes

A — One dedicated function

Section B: Match the Pairs

embedded system → A computer system built into a larger device to perform one dedicated function, usually running a fixed program

microwave timer controller → An embedded system inside a microwave that only controls the cooking time and power

An embedded system has a dedicated function and usually runs a fixed program stored in the device → washing_machine_controller = run("wash_program")

An embedded system is built into a larger device and is usually small and low cost → device = Thermostat(embedded_chip = True)

embedded_system = runs_any_software_the_user_installs → An embedded system has one dedicated function and usually a fixed program. Running any software the user installs describes a general-purpose computer.

embedded_system = separate_desktop_computer → An embedded system is built into a larger device, not a separate stand-alone computer like a desktop.

Section C: Definitions

embedded system — A computer system built into a larger device to perform one dedicated function, usually running a fixed program. Examples: a washing machine controller or a microwave timer.

Section D: Fill in the Blanks

A microwave timer is an embedded system

An embedded system is built into a device

Most embedded systems run a fixed program

Embedded systems have one dedicated function

Embedded systems are small and low cost

Section E: Spot the Error

B — The microwave timer should count down while time is greater than 0. With < 0 the loop never runs, so the dedicated timer task never happens. It should be WHILE time > 0.

C — The washing machine controller must assign a value to the heater output using the assignment arrow. It should be heater ← ON.

C — The IF statement is missing THEN. This embedded thermostat program should read IF temp > 25 THEN.

D — The alarm's one dedicated function is to sound when the door opens. Setting the siren to OFF means the alarm never sounds. It should be siren ← ON.

A — An embedded system usually runs a fixed program stored in ROM, so it is not rewritten daily. The comment should say the program is fixed and stored in ROM.