Wire library for I2C in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Arduino

Wire.[1]();

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

Astart

Bopen

Cinit

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' instead of 'begin' causes a compilation error.

Trying to use 'init' or 'open' which are not Wire library functions.

The Wire.begin() function initializes the I2C bus as a master.

2fill in blank

medium

Complete the code to send a byte of data over I2C.

Arduino

Wire.[1](0x42);

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

Awrite

Bsend

Ctransmit

Dput

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'send' or 'transmit' which are not valid Wire functions.

Confusing with other communication libraries.

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

3fill in blank

hard

Fix the error in the code to request 4 bytes from a device with address 0x3C.

Arduino

Wire.requestFrom([1], 4);

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

A0x30

B0xC3

C0x3C

D0x03

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong address like 0x30 or 0xC3 causes no response.

Confusing 7-bit and 8-bit addresses.

The device address must be the 7-bit I2C address, here 0x3C.

4fill in blank

hard

Fill both blanks to start transmission to address 0x50 and end it properly.

Arduino

Wire.[1](0x50);
Wire.[2]();

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

AbeginTransmission

Bstart

CendTransmission

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' or 'stop' which are not Wire library functions.

Mixing up the order of functions.

beginTransmission() starts communication with the device, and endTransmission() ends it.

5fill in blank

hard

Fill all three blanks to read bytes from a device and store them in a variable.

Arduino

int data = Wire.[1]();
while(Wire.[2]()) {
  data = Wire.[3]();
}

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

Aavailable

Cread

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'write' instead of 'read' to get data.

Confusing 'available' with 'read'.

Wire.available() checks if data is ready to read, and Wire.read() reads the data byte.