Temperature sensor

Name:

Date:

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Quick Questions

Shade in the A or B circle for each question.

1. What data does a temperature sensor capture?

A How much moisture is in the soil

B How hot or cold something is

2. A temperature sensor is which type of device?

A An output device

B An input device

3. Which system would use a temperature sensor to keep a room at the right warmth?

A Central heating

B A barcode scanner at a till

4. Why does an oven need a temperature sensor?

A To check the inside is as hot as it should be

B To count how many items are inside

5. A greenhouse uses a temperature sensor. What is it used for?

A Keeping the air warm enough for plants to grow

B Playing sound to help the plants grow

Match the Pairs

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

Left column		Right column
1temperature sensor		AThis describes a moisture sensor. A temperature sensor measures how hot or cold the greenhouse air is.
2temperature > 25 -> fan ON		BAn input device that measures how hot or cold something is
3A central heating system uses a temperature sensor to switch the boiler on when a room is too cold		CA sensor is an input device. It sends temperature readings in, and the heating element is the output that heats the oven.
4A weather station uses a temperature sensor to record the air temperature at regular intervals		DIF roomTemp < 18 THEN boiler ON
5A temperature sensor measures how much moisture is in the soil of a greenhouse		EA control rule where a temperature reading above a set value turns on a fan, as in a greenhouse
6An oven uses a temperature sensor as an output device to heat the food		FairTemp <- readTemperatureSensor()

Definitions

temperature sensor

Fill in the Blanks

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

WHILE temperature _ 180 oven_heater ← ON ENDWHILE

__ temperature < 18 THEN heating ← ON ENDIF

IF ___________ > 30 THEN window ← OPEN ENDIF

_____ temperature OUTPUT "Temp: ", temperature

IF temperature <= 0 THEN OUTPUT "Frost warning" _____

Spot the Error

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

Question 1

A temp ← ReadTemperature()

B IF temp > 18 THEN

C heating ← ON

D ENDIF

Question 2

A ovenTemp ← ReadHumidity()

B IF ovenTemp >= 200 THEN

C heater ← OFF

D ENDIF

Question 3

A temp ← ReadTemperature()

B IF temp > 30

C window ← OPEN

D ELSE

E window ← CLOSED

F ENDIF

Question 4

A total ← 0

B FOR day ← 1 TO 7

C total ← total + day

D NEXT day

E OUTPUT total / 7

Question 5

A target ← 21

B target ← ReadTemperature()

C IF temp < target THEN

D heating ← ON

E ENDIF

Answer Key

Temperature sensor

Section A: Quick Questions

B — How hot or cold something is

B — An input device

A — Central heating

A — To check the inside is as hot as it should be

A — Keeping the air warm enough for plants to grow

Section B: Match the Pairs

temperature sensor → An input device that measures how hot or cold something is

temperature > 25 -> fan ON → A control rule where a temperature reading above a set value turns on a fan, as in a greenhouse

A central heating system uses a temperature sensor to switch the boiler on when a room is too cold → IF roomTemp < 18 THEN boiler ON

A weather station uses a temperature sensor to record the air temperature at regular intervals → airTemp <- readTemperatureSensor()

A temperature sensor measures how much moisture is in the soil of a greenhouse → This describes a moisture sensor. A temperature sensor measures how hot or cold the greenhouse air is.

An oven uses a temperature sensor as an output device to heat the food → A sensor is an input device. It sends temperature readings in, and the heating element is the output that heats the oven.

Section C: Definitions

temperature sensor — An input device that measures how hot or cold something is. Used in central heating, ovens, greenhouses and weather stations.

Section D: Fill in the Blanks

WHILE temperature < 180
   oven_heater ← ON
ENDWHILE

IF temperature < 18 THEN
   heating ← ON
ENDIF

IF temperature > 30 THEN
   window ← OPEN
ENDIF

INPUT temperature
OUTPUT "Temp: ", temperature

IF temperature <= 0 THEN
   OUTPUT "Frost warning"
ENDIF

Section E: Spot the Error

B — The central heating should switch on when the temperature is too cold. The condition should be temp < 18, not temp > 18.

A — The oven needs a temperature sensor to measure how hot it is. ReadHumidity() reads the wrong sensor. It should be ReadTemperature().

B — An IF statement must end the condition with THEN. The line should be IF temp > 30 THEN.

C — The weather station should add the temperature reading to the total, not the day number. It should be total ← total + ReadTemp().

B — This overwrites the target value and temp is never given a value. The sensor reading should be stored in temp: temp ← ReadTemperature().