OLED display with I2C (SSD1306) in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the OLED display with the correct I2C address.

Arduino

#include <Wire.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Wire.begin();
  if(!display.begin(SSD1306_SWITCHCAPVCC, [1])) {
    for(;;); // Don't proceed, loop forever
  }
}

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

A0x3C

B0x68

C0x27

D0x50

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong I2C address causes the display not to initialize.

Confusing OLED address with other sensor addresses.

The common I2C address for SSD1306 OLED displays is 0x3C. Using this address initializes the display correctly.

2fill in blank

medium

Complete the code to clear the display before showing new content.

Arduino

void loop() {
  display.[1]();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("Hello, OLED!");
  display.display();
  delay(2000);
}

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

Areset

BclearScreen

Cclear

DclearDisplay

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent method like clearScreen() or clear().

Not clearing the display before drawing new content causes overlapping text.

The method clearDisplay() clears the buffer so the new content can be drawn fresh.

3fill in blank

hard

Fix the error in the code to display a number on the OLED.

Arduino

int counter = 0;

void loop() {
  display.clearDisplay();
  display.setCursor(0, 10);
  display.print("Count: ");
  display.print([1]);
  display.display();
  counter++;
  delay(1000);
}

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

A"counter"

Bcounter

Ccounter()

DCounter

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the variable name in quotes prints the word 'counter' instead of the number.

Using parentheses like counter() treats it like a function, causing errors.

To print the value of the variable counter, use its name without quotes or parentheses.

4fill in blank

hard

Fill both blanks to loop through an array of words, printing those longer than 3 characters along with their lengths to the Serial monitor.

Arduino

String words[] = {"cat", "house", "dog", "elephant"};
int size = 4;

void setup() {
  Serial.begin(9600);
  for (int i = 0; i < size; i++) {
    if (words[i].length() [1] 3) {
      Serial.print(words[i]);
      Serial.print(": ");
      Serial.println(words[i].[2]());
    }
  }
}

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

A>

Blength

Clength()

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' reverses the filter logic.

Using 'length' without parentheses is incorrect for Arduino Strings.

To filter words longer than 3 characters, use '>' and to get the length, use the length() method.

5fill in blank

hard

Fill all three blanks to create a loop that displays each character of a string on the OLED at increasing x positions.

Arduino

String message = "Hi!";

void loop() {
  display.clearDisplay();
  for (int i = 0; i < message.length(); i++) {
    display.setCursor([1], 0);
    display.print(message.[2](i));
  }
  display.display();
  delay(2000);
}

// Calculate x position as i times 6 pixels
// int xPos = i [3] 6;
// Use xPos or equivalent expression for [1]

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

Ai * 6

BcharAt

C*

Di + 6

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '*' causes overlapping characters.

Using message[i] instead of charAt(i) is invalid for Arduino String.

The x position is i multiplied by 6 pixels, the method to get a character is charAt, and the operator is '*'.