Bluetooth with HC-05/HC-06 module in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the HC-05 Bluetooth module used for?

The HC-05 module is used to add wireless Bluetooth communication to Arduino projects, allowing devices to send and receive data wirelessly.

beginner

How do you connect the HC-05 module to an Arduino board?

Connect HC-05 VCC to 5V, GND to GND, TXD to Arduino RX pin, and RXD to Arduino TX pin (usually through a voltage divider to protect the module).

intermediate

What is the difference between HC-05 and HC-06 modules?

HC-05 can act as both master and slave device, while HC-06 works only as a slave device. HC-05 is more versatile for Bluetooth communication.

beginner

How do you send data from Arduino to a Bluetooth device using HC-05?

Use the Serial communication commands like Serial.write() or Serial.print() to send data through the HC-05 module connected to Arduino's serial pins.

intermediate

Why is a voltage divider needed on the HC-05 RX pin?

Because the HC-05 RX pin works at 3.3V logic level, and Arduino TX pin outputs 5V, a voltage divider reduces 5V to 3.3V to protect the module.

Which pin on the HC-05 module should be connected to Arduino's RX pin?

A HC-05 TXD pin

B HC-05 RXD pin

C HC-05 VCC pin

D HC-05 GND pin

The HC-05 TXD pin sends data to Arduino's RX pin.

What role does the HC-05 module play in Bluetooth communication?

A It powers the Arduino board

B It controls the Arduino's motor

C It stores data permanently

D It acts as a wireless communication bridge

HC-05 enables wireless data transfer between devices.

Which Arduino function is commonly used to send data via HC-05?

A delay()

B Serial.print()

C analogRead()

D digitalWrite()

Serial.print() sends data over serial communication to HC-05.

What voltage level should the HC-05 RX pin receive?

A 12V

B 5V

C 3.3V

D 1.8V

HC-05 RX pin works at 3.3V logic level to avoid damage.

Which module can act as both master and slave in Bluetooth communication?

A HC-05

B HC-06

C Both HC-05 and HC-06

D Neither HC-05 nor HC-06

HC-05 supports master and slave modes; HC-06 supports only slave mode.

Explain how to connect and communicate with an HC-05 Bluetooth module using Arduino.

Think about wiring and serial communication steps.

Describe the main differences between HC-05 and HC-06 Bluetooth modules.

Focus on device roles and flexibility.