Using sensor libraries in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include the sensor library.

Arduino

#include [1]

Drag options to blanks, or click blank then click option'

A<DHT.h>

B"DHT.h"

C<Wire.h>

D"Servo.h"

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes instead of angle brackets for installed sensor libraries.

Including the wrong library like Servo.h.

The sensor library DHT.h is included using angle brackets because it is an installed Arduino library.

2fill in blank

medium

Complete the code to create a sensor object named 'sensor'.

Arduino

DHT [1](2, DHT22);

Drag options to blanks, or click blank then click option'

AmySensor

BDHT

CtempSensor

Dsensor

Attempts:

3 left

💡 Hint

Common Mistakes

Using the class name 'DHT' as the object name.

Using unrelated names like 'tempSensor' without context.

The sensor object is named 'sensor' to match the example.

3fill in blank

hard

Fix the error in the setup function to start the sensor.

Arduino

void setup() {
  Serial.begin(9600);
  [1].begin();
}

Drag options to blanks, or click blank then click option'

Adht

BSensor

Csensor

DDHT

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect capitalization like 'Sensor' or 'DHT'.

Calling begin() on the class name instead of the object.

The sensor object is named 'sensor' and must be called with .begin() to initialize.

4fill in blank

hard

Fill both blanks to read temperature and humidity from the sensor.

Arduino

float humidity = [1].readHumidity();
float temperature = [2].readTemperature();

Drag options to blanks, or click blank then click option'

Asensor

BtempSensor

CSensor

Ddht

Attempts:

3 left

💡 Hint

Common Mistakes

Using different or incorrect object names for humidity and temperature.

Using capitalized names that do not match the object.

The sensor object named 'sensor' is used to call both readHumidity() and readTemperature() methods.

5fill in blank

hard

Fill all three blanks to check if readings are valid and print them.

Arduino

if (isnan([1]) || isnan([2])) {
  Serial.println("Failed to read from [3] sensor!");
  return;
}

Drag options to blanks, or click blank then click option'

Ahumidity

Btemperature

CDHT

Dsensor

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names in isnan checks.

Mentioning the object name instead of the class name in the message.

We check if humidity or temperature is NaN and print an error message mentioning the DHT sensor.