Connecting multiple I2C devices in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the I2C bus.

Arduino

#include <Wire.h>

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

void loop() {}

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

Ainit

Bstart

Cbegin

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using Wire.start() instead of Wire.begin()

Forgetting to include the Wire library

The Wire.begin() function initializes the I2C bus on Arduino.

2fill in blank

medium

Complete the code to request 6 bytes from an I2C device with address 0x3C.

Arduino

Wire.[1](0x3C, 6);

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ArequestFrom

Bsend

Cread

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using Wire.write() to request data

Using Wire.send() which is deprecated

The Wire.requestFrom(address, quantity) function requests bytes from a device on the I2C bus.

3fill in blank

hard

Fix the error in the code to write a byte 0x01 to device address 0x50.

Arduino

Wire.beginTransmission(0x50);
Wire.[1](0x01);
Wire.endTransmission();

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Asend

Bread

CrequestFrom

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using Wire.send() which is deprecated

Using Wire.requestFrom() which is for reading

The Wire.write() function sends data bytes to the I2C device.

4fill in blank

hard

Fill both blanks to create a dictionary of device addresses and their names.

Arduino

const char* devices[] = {"Sensor", "Display", "EEPROM"};
int addresses[] = {0x40, 0x3C, 0x50};

for (int i = 0; i < 3; i++) {
  Serial.print(devices[[1]]);
  Serial.print(" at address 0x");
  Serial.println(addresses[[2]], HEX);
}

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Ai

B0

C1

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using fixed indices instead of the loop variable

Mixing different indices for devices and addresses

Using the loop variable i accesses the corresponding device name and address.

5fill in blank

hard

Fill all three blanks to read 4 bytes from device 0x3C and store them in an array.

Arduino

byte data[4];
Wire.beginTransmission([1]);
Wire.endTransmission();
Wire.requestFrom([2], [3]);
for (int i = 0; i < 4; i++) {
  if (Wire.available()) {
    data[i] = Wire.read();
  }
}

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

A0x3C

B0x50

C4

D6

Attempts:

3 left

💡 Hint

Common Mistakes

Using different addresses for transmission and request

Requesting wrong number of bytes

The device address is 0x3C and we request 4 bytes to read into the array.