I2C scanner sketch in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start the I2C communication.

Arduino

#include <Wire.h>

void setup() {
  Serial.begin(9600);
  Wire.[1]();
  Serial.println("I2C Scanner");
}

void loop() {
  // scanning code here
}

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

AbeginTransmission

BendTransmission

CrequestFrom

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using Wire.beginTransmission() instead of Wire.begin() to start I2C.

Forgetting to call Wire.begin() before scanning.

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

2fill in blank

medium

Complete the code to check if a device acknowledges at a given address.

Arduino

for (byte address = 1; address < 127; address++) {
  Wire.beginTransmission(address);
  byte error = Wire.[1]();
  if (error == 0) {
    Serial.print("Device found at address 0x");
    Serial.println(address, HEX);
  }
}

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AendTransmission

BrequestFrom

Cbegin

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using Wire.requestFrom() instead of Wire.endTransmission() to check device.

Not checking the return value of Wire.endTransmission().

Wire.endTransmission() sends the address and returns 0 if a device acknowledges.

3fill in blank

hard

Fix the error in the code to print the address in hexadecimal format.

Arduino

Serial.print("Device found at address 0x");
Serial.println([1], HEX);

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Aaddress()

Baddress

Caddr

DAddress

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function call like address() which does not exist.

Using a variable name with wrong capitalization.

The variable holding the address is named 'address', so use it directly.

4fill in blank

hard

Fill both blanks to complete the loop that scans all I2C addresses and prints found devices.

Arduino

for (byte [1] = 1; [1] < 127; [1]++) {
  Wire.beginTransmission([2]);
  byte error = Wire.endTransmission();
  if (error == 0) {
    Serial.print("Found device at 0x");
    Serial.println([2], HEX);
  }
}

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Aaddress

Baddr

Ci

Ddevice

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in the loop and function calls causing errors.

Using non-descriptive variable names that confuse the code.

The variable 'address' is used consistently to scan and print device addresses.

5fill in blank

hard

Fill all three blanks to complete the I2C scanner sketch that prints 'No devices found' if none are detected.

Arduino

bool deviceFound = false;
for (byte [1] = 1; [1] < 127; [1]++) {
  Wire.beginTransmission([2]);
  byte error = Wire.endTransmission();
  if (error == 0) {
    Serial.print("Device at 0x");
    Serial.println([3], HEX);
    deviceFound = true;
  }
}
if (!deviceFound) {
  Serial.println("No devices found");
}

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

Aaddress

Baddr

Ddevice

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names causing compilation errors.

Forgetting to set deviceFound to true when a device is found.

The variable 'address' is used consistently to scan and print device addresses.