Why communication protocols matter in Arduino - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start serial communication at 9600 baud rate.

Arduino

void setup() {
  Serial.begin([1]);
}

void loop() {
  // Your code here
}

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

A4800

B115200

C19200

D9600

Attempts:

3 left

💡 Hint

Common Mistakes

Using a baud rate not supported by the device.

Forgetting to set the baud rate.

The standard baud rate for simple serial communication is 9600 bits per second.

2fill in blank

medium

Complete the code to send the text 'Hello' over serial communication.

Arduino

void loop() {
  Serial.[1]("Hello");
  delay(1000);
}

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

Aprint

Bwrite

Cprintln

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using write which sends raw bytes.

Using a non-existent send function.

println sends the text followed by a new line, which is useful for clear output.

3fill in blank

hard

Fix the error in the code to read incoming serial data correctly.

Arduino

void loop() {
  if (Serial.[1]() > 0) {
    int incomingByte = Serial.read();
  }
}

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

Aavailable

BavailableForWrite

CisAvailable

DreadAvailable

Attempts:

3 left

💡 Hint

Common Mistakes

Using availableForWrite which checks if you can write.

Using non-existent functions.

Serial.available() returns the number of bytes available to read.

4fill in blank

hard

Fill both blanks to create a simple protocol that sends a command and waits for a response.

Arduino

void loop() {
  Serial.[1]("CMD_START");
  while (Serial.[2]() == 0) {
    // wait for response
  }
}

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

Aprintln

Bavailable

CavailableForWrite

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using print without newline.

Checking availableForWrite instead of available.

Use println to send the command with a newline, and available to check for incoming data.

5fill in blank

hard

Fill all three blanks to implement a protocol that sends a command, reads the response, and prints it.

Arduino

void loop() {
  Serial.[1]("GET_DATA");
  while (Serial.[2]() == 0) {}
  int data = Serial.[3]();
  Serial.println(data);
  delay(1000);
}

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

Aprintln

Bavailable

Cread

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of println.

Using readBytes instead of read.

Send the command with println, wait until data is available with available, then read the data with read.