Reading I2C sensor data in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include the Wire library for I2C communication.

Arduino

#include [1]

void setup() {
  Wire.begin();
}

void loop() {
  // sensor reading code
}

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

A<Wire.h>

B<SPI.h>

C<Servo.h>

D<EEPROM.h>

Attempts:

3 left

💡 Hint

Common Mistakes

Including SPI or Servo libraries instead of Wire.

Forgetting to include any library.

The Wire library is required for I2C communication on Arduino. Including allows you to use I2C functions.

2fill in blank

medium

Complete the code to start I2C communication as a master device.

Arduino

void setup() {
  [1]();
}

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

ASerial.begin

BWire.begin

CWire.start

DSerial.start

Attempts:

3 left

💡 Hint

Common Mistakes

Using Serial.begin instead of Wire.begin.

Using Wire.start which does not exist.

Wire.begin() initializes the Arduino as an I2C master device.

3fill in blank

hard

Fix the error in the code to request 2 bytes from the sensor at address 0x40.

Arduino

Wire.requestFrom([1], 2);

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A0x20

B0x04

C0x40

D40

Attempts:

3 left

💡 Hint

Common Mistakes

Using decimal 40 instead of hex 0x40.

Using wrong sensor address.

The sensor address is 0x40 in hexadecimal. Using 0x40 correctly requests data from the sensor.

4fill in blank

hard

Fill both blanks to read two bytes from the sensor and combine them into a single integer.

Arduino

if (Wire.available()) {
  int highByte = Wire.read();
  int lowByte = Wire.[1]();
  int value = (highByte [2] 8) | lowByte;
}

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

Aread

B<<

C>>

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using Wire.available() instead of Wire.read() to get the byte.

Using right shift (>>) instead of left shift (<<).

Wire.read() reads the next byte. Shifting highByte left by 8 bits combines it with lowByte to form a 16-bit value.

5fill in blank

hard

Fill all three blanks to write a command byte 0x01 to the sensor at address 0x40 and end transmission.

Arduino

Wire.beginTransmission([1]);
Wire.[2](0x01);
Wire.[3]();

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A0x20

Bwrite

CendTransmission

D0x40

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong sensor address 0x20.

Using print() instead of write() to send data.

Forgetting to end transmission.

beginTransmission starts communication with sensor at 0x40, write sends the command byte, and endTransmission ends the I2C communication.