Devices that use embedded systems

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Quick Questions

Shade in the A or B circle for each question.

1. Which device contains an embedded system?

A A washing machine

B A printed textbook

2. What job does an embedded system do in a microwave oven?

A Lets the user install new games and apps

B Controls the cooking time and power level

3. Which is a use of an embedded system in a car?

A Editing documents for the driver

B Engine management that controls fuel and ignition

4. Which statement about an alarm system is correct?

A It uses an embedded system to read sensors and sound the alarm

B It has no processor and works by magic

5. How does an automatic lighting system use an embedded system?

A It switches lights on or off based on light or movement sensor data

B It lets the user browse the internet on the light switch

Match the Pairs

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

Left column		Right column
1Washing machine or microwave		AAn embedded system in a car that controls fuel injection and engine timing using sensor data
2Car engine management		BIF money >= price THEN release_item
3An embedded system in a security system uses sensors and sounds a siren when it detects movement		CA domestic appliance that uses an embedded system to control its timer, temperature and programs
4An embedded system in a vending machine checks the money inserted and releases the chosen item		DAutomatic lighting uses an embedded system with a fixed program. Users do not install or run different programs on it.
5A vending machine is a general-purpose computer because it has a processor		EIF motion_sensor = TRUE THEN sound_alarm
6Automatic lighting is controlled by the user running different programs on it		FA processor does not make a device general-purpose. A vending machine has an embedded system that does one set job: selling items.

Definitions

embedded system

Fill in the Blanks

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

IF doorClosed = TRUE ____ OUTPUT "Start wash" ENDIF

IF fuelLevel _ 10 THEN OUTPUT "Low fuel" ENDIF

IF movement = TRUE THEN ______ "ALARM" ENDIF

IF lightLevel < 30 THEN OUTPUT "Lamp on" _____

_____ moneyIn < price INPUT coin ENDWHILE

Spot the Error

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

Question 1

A INPUT door FROM sensor

B IF door = 'closed' THEN

C START motor

D ENDWHILE

Question 2

A INPUT seconds FROM keypad

B WHILE seconds < 0 DO

C seconds <- seconds - 1

D ENDWHILE

E TURN OFF magnetron

Question 3

A INPUT temp FROM engine_sensor

B IF temp > 100 THEN

C TURN OFF cooling_fan

D ENDIF

Question 4

A INPUT motion FROM sensor

B IF motion = TRUE

C SOUND siren

D ENDIF

Question 5

A INPUT light FROM sensor

B IF light < 20 THEN

C lamp <- ON

D ELSE:

E lamp <- OFF

F ENDIF

Answer Key

Devices that use embedded systems

Section A: Quick Questions

A — A washing machine

B — Controls the cooking time and power level

B — Engine management that controls fuel and ignition

A — It uses an embedded system to read sensors and sound the alarm

A — It switches lights on or off based on light or movement sensor data

Section B: Match the Pairs

Washing machine or microwave → A domestic appliance that uses an embedded system to control its timer, temperature and programs

Car engine management → An embedded system in a car that controls fuel injection and engine timing using sensor data

An embedded system in a security system uses sensors and sounds a siren when it detects movement → IF motion_sensor = TRUE THEN sound_alarm

An embedded system in a vending machine checks the money inserted and releases the chosen item → IF money >= price THEN release_item

A vending machine is a general-purpose computer because it has a processor → A processor does not make a device general-purpose. A vending machine has an embedded system that does one set job: selling items.

Automatic lighting is controlled by the user running different programs on it → Automatic lighting uses an embedded system with a fixed program. Users do not install or run different programs on it.

Section C: Definitions

embedded system — A computer built into a device to do one set job, such as in a washing machine, car engine control, alarm, automatic lighting or vending machine.

Section D: Fill in the Blanks

IF doorClosed = TRUE THEN
  OUTPUT "Start wash"
ENDIF

IF fuelLevel < 10 THEN
  OUTPUT "Low fuel"
ENDIF

IF movement = TRUE THEN
  OUTPUT "ALARM"
ENDIF

IF lightLevel < 30 THEN
  OUTPUT "Lamp on"
ENDIF

WHILE moneyIn < price
  INPUT coin
ENDWHILE

Section E: Spot the Error

D — The washing machine program uses an IF, so it must end with ENDIF, not ENDWHILE.

B — The microwave should keep counting down while seconds is greater than 0. With < 0 the loop never runs. It should be WHILE seconds > 0 DO.

C — The engine management system should switch the fan ON when the engine is too hot, not OFF. It should be TURN ON cooling_fan.

B — The IF statement is missing THEN. It should be IF motion = TRUE THEN.

D — Pseudocode ELSE has no colon after it. The automatic lighting program should use just ELSE.