Sending data over Bluetooth in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the common Arduino module used for Bluetooth communication?

The HC-05 module is commonly used for Bluetooth communication with Arduino. It allows wireless data transfer between devices.

beginner

How do you initialize serial communication with a Bluetooth module in Arduino?

You use Serial.begin(baud_rate); where baud_rate matches the Bluetooth module's speed, often 9600.

beginner

Which Arduino function sends data over Bluetooth once serial communication is set up?

You use Serial.print() or Serial.println() to send data over Bluetooth.

intermediate

Why is it important to match baud rates between Arduino and Bluetooth module?

Matching baud rates ensures data is sent and received correctly without errors or garbled messages.

beginner

What is a simple example code snippet to send 'Hello' over Bluetooth using Arduino?

void setup() { Serial.begin(9600); // Start serial at 9600 baud } void loop() { Serial.println("Hello"); // Send 'Hello' over Bluetooth delay(1000); // Wait 1 second }

Which Arduino function starts serial communication with a Bluetooth module?

A Serial.open()

B Serial.send()

C Bluetooth.start()

D Serial.begin()

Serial.begin() initializes serial communication at a specified baud rate.

What baud rate is commonly used for HC-05 Bluetooth modules?

A 9600

B 4800

C 115200

D 19200

9600 baud is the default and most common speed for HC-05 modules.

Which function sends a line of text over Bluetooth in Arduino?

A Serial.println()

B Serial.print()

C Serial.write()

D Serial.read()

Serial.println() sends data followed by a new line, useful for sending text lines.

Why must baud rates match between Arduino and Bluetooth module?

A To save power

B To increase speed

C To avoid data errors

D To connect to Wi-Fi

Matching baud rates prevents data corruption during transmission.

What does the delay(1000) function do in the Bluetooth sending loop?

A Sends data faster

B Waits 1 second before next send

C Stops Bluetooth

D Resets Arduino

delay(1000) pauses the program for 1000 milliseconds (1 second).

Explain how to send data from an Arduino to another device using Bluetooth.

Think about setting up communication and sending messages step by step.

Describe why baud rate matching is important in Bluetooth communication with Arduino.

Consider what happens if two people talk at different speeds.