HC-05 Bluetooth Serial UART Module for Arduino

The HC-05 Bluetooth Serial UART Module for Arduino adds wireless serial communication to Arduino and compatible microcontroller projects. Using a UART interface and Bluetooth Classic connectivity, it is ideal for robot control, wireless data transfer, sensor monitoring, automation, and DIY electronics applications.

Description

The HC-05 Bluetooth Serial UART Module for Arduino is a popular wireless communication module designed to provide Bluetooth serial connectivity for microcontroller-based projects.

The module communicates with a host controller through a UART serial interface, allowing serial data to be transmitted wirelessly between compatible Bluetooth devices and embedded systems. This makes the HC-05 particularly useful when a wired serial connection is inconvenient.

It is commonly used with Arduino Uno, Nano, Mega, and other UART-capable development boards. Typical applications include Bluetooth-controlled robot cars, wireless sensor monitoring, home automation, remote control systems, and serial data communication.

HC-05 modules commonly support configurable operation through AT commands, allowing supported parameters such as the module name, pairing settings, and communication configuration to be adjusted. Exact AT commands and operating modes can vary with the firmware and breakout-board revision supplied.

For Arduino projects, the module can be connected to hardware UART pins or a suitable software serial interface, depending on the board and application.

Key Features

• HC-05 Bluetooth module
• Bluetooth Classic wireless communication
• UART serial interface
• Suitable for Arduino projects
• Wireless serial data communication
• Supports bidirectional communication
• AT command configuration on supported firmware
• Suitable for robot control
• Useful for wireless sensor projects
• Compact breakout-board format
• Easy microcontroller integration
• Suitable for automation projects
• Useful for DIY electronics and prototyping

Technical Specifications

*HC-05 breakout boards and firmware revisions vary. The exact supply range, default baud rate, AT-mode baud rate, pin configuration, and firmware behavior should be verified on the actual module sold by Chip.pk.

Product Attributes

Pinout / Interface

A common HC-05 breakout module provides the following connections:

VCC — Module power input
GND — Ground
TXD — UART transmit output
RXD — UART receive input
STATE — Connection-status output on supported boards
EN / KEY — Used for configuration/AT mode on supported versions

Typical Arduino communication:

Arduino TX → HC-05 RX
Arduino RX ← HC-05 TX
Arduino GND ↔ HC-05 GND

Important: The HC-05 core uses 3.3V logic. When connecting a 5V microcontroller such as an Arduino Uno, appropriate voltage-level consideration should be given to the HC-05 RX input. Follow the specifications of the actual breakout board being supplied.

Compatibility

Commonly used with:

• Arduino Uno
• Arduino Nano
• Arduino Mega
• Arduino Pro Mini
• Other UART-capable microcontrollers
• Compatible embedded systems
• Bluetooth Classic compatible host devices

HC-05 uses Bluetooth Classic, not Bluetooth Low Energy (BLE). Device compatibility therefore depends on whether the host supports the required Bluetooth Classic serial profile.

Applications

• Bluetooth-Controlled Robot Cars
• Arduino Wireless Projects
• Wireless Serial Communication
• Robot Control
• Sensor Data Transmission
• Home Automation
• Remote Device Control
• DIY Electronics
• Embedded Systems
• Wireless Monitoring
• Prototype Development
• Educational Electronics Projects

Package Includes

• 1 × HC-05 Bluetooth Serial UART Module

Arduino boards, jumper wires, cables, and other accessories are included only if specifically stated with the product.

Buy in Pakistan

Buy the HC-05 Bluetooth Serial UART Module for Arduino from Chip.pk for wireless serial communication, robotics, automation, and Arduino projects. The HC-05 provides a convenient Bluetooth Classic UART connection for compatible microcontrollers and embedded systems.

Why Choose Chip.pk?

• Quality-checked communication modules
• Competitive pricing
• Secure packaging
• Nationwide delivery across Pakistan
• Wide range of Arduino, wireless, IoT, and robotics components
• Clear technical product information
• Support for students, makers, engineers, and developers
• Reliable customer service and after-sales support

FAQs

1. What is the HC-05 Bluetooth Module?

The HC-05 Bluetooth Serial UART Module is a wireless communication module that allows Arduino and other compatible microcontrollers to exchange serial data with Bluetooth Classic devices through a UART interface.

2. Is the HC-05 compatible with Arduino?

Yes. The HC-05 is commonly used with Arduino Uno, Nano, Mega, Pro Mini, and other boards that provide UART serial communication.

3. Does the HC-05 use Bluetooth Classic or BLE?

The HC-05 uses Bluetooth Classic. It is not a Bluetooth Low Energy (BLE) module.

4. What communication interface does the HC-05 use?

It communicates with a microcontroller through UART serial communication using TX and RX connections.

5. Can the HC-05 send and receive data?

Yes. It provides bidirectional serial communication, allowing compatible devices to both transmit and receive data wirelessly.

6. Can I configure the HC-05 using AT commands?

Yes, common HC-05 firmware supports AT commands for configuration. Available commands and configuration procedures can vary between module and firmware revisions.

7. What is the default baud rate of the HC-05?

Many HC-05 modules commonly use 9600 bps in normal communication mode, but the exact default should be verified for the supplied module because firmware revisions can differ.

8. Can I use HC-05 for an Arduino robot car?

Yes. The HC-05 is commonly used to create Bluetooth-controlled robot cars, allowing compatible devices to send movement commands to an Arduino or other controller.

9. Can HC-05 be used for wireless sensor monitoring?

Yes. Sensor readings collected by a microcontroller can be transmitted over the HC-05's Bluetooth serial connection to a compatible receiving device.

10. What is the difference between HC-05 and HC-06?

HC-05 modules generally provide more configurable operating capabilities, while HC-06 modules are commonly used in simpler serial Bluetooth configurations. Exact functionality depends on the firmware version of each module.

11. Does HC-05 work directly with 5V Arduino boards?

Common HC-05 breakout boards may accept a 5V supply input, but the HC-05 core uses 3.3V logic. Appropriate voltage-level consideration should be given to the module's RX input when interfacing with 5V controllers.

12. Where can I buy the HC-05 Bluetooth Module in Pakistan?

You can buy the HC-05 Bluetooth Serial UART Module for Arduino from Chip.pk with nationwide delivery across Pakistan.

13. Where can I buy the HC-05 Bluetooth Module in Lahore?

Customers in Lahore can purchase the HC-05 Bluetooth Serial UART Module from Chip.pk, subject to stock availability.