Sending data over Bluetooth in Arduino - Mini Project: Build & Apply

Sending data over Bluetooth

📖 Scenario: You want to send simple messages from your Arduino to a phone or computer using Bluetooth. This is useful for projects like remote sensors or wireless controls.

🎯 Goal: Build a small Arduino program that sends a message over Bluetooth every second.

📋 What You'll Learn

Use the SoftwareSerial library to create a Bluetooth serial connection.

Set up Bluetooth communication on pins 10 (RX) and 11 (TX).

Send the message "Hello Bluetooth" every second.

Print the message to the Bluetooth serial port.

💡 Why This Matters

🌍 Real World

Sending data wirelessly from Arduino to phones or computers is common in home automation, remote controls, and sensor monitoring.

💼 Career

Understanding Bluetooth communication is useful for embedded systems developers and IoT engineers who build connected devices.

1

Set up Bluetooth serial connection

Write code to include the SoftwareSerial library and create a Bluetooth serial object called bluetooth using pins 10 for RX and 11 for TX.

Arduino

# Include SoftwareSerial library and create bluetooth serial on pins 10 and 11
// Your code here

Need a hint?

Use #include <SoftwareSerial.h> and then SoftwareSerial bluetooth(10, 11);

2

Initialize Bluetooth communication

In the setup() function, start the bluetooth serial communication at 9600 baud rate.

Arduino

#include 

SoftwareSerial bluetooth(10, 11); // RX, TX

void setup() {
  // Start bluetooth serial at 9600 baud
  // Your code here
}

void loop() {

}

Need a hint?

Use bluetooth.begin(9600); inside setup().

3

Send message over Bluetooth

In the loop() function, send the message "Hello Bluetooth" using bluetooth.println().

Arduino

#include 

SoftwareSerial bluetooth(10, 11); // RX, TX

void setup() {
  bluetooth.begin(9600);
}

void loop() {
  // Send message over bluetooth
  // Your code here
}

Need a hint?

Use bluetooth.println("Hello Bluetooth"); inside loop().

4

Add delay and print output

Add a delay(1000); after sending the message in loop() to send the message every second.

Arduino

#include 

SoftwareSerial bluetooth(10, 11); // RX, TX

void setup() {
  bluetooth.begin(9600);
}

void loop() {
  bluetooth.println("Hello Bluetooth");
  // Add delay of 1000 milliseconds
  // Your code here
}

Need a hint?

Use delay(1000); to wait one second between messages.