BMT HC-05 Bluetooth Module 6-Pin V2.0 Master Slave 3.3V for Arduino MCU

The BMT HC-05 6-Pin Bluetooth Module is a versatile Bluetooth V2.0 + EDR wireless serial communication module designed to provide simple and reliable wireless connectivity between microcontrollers, computers, smartphones, and embedded systems. Supporting both Master and Slave operating modes, the HC-05 is ideal for Arduino, STM32, AVR, PIC, ESP32, Raspberry Pi, and other UART-compatible development platforms.

Powered by the industry-proven CSR Bluetooth chipset, the HC-05 enables transparent serial communication over Bluetooth, allowing developers to replace wired UART connections with a convenient wireless link. It is widely used in robotics, home automation, wireless sensor networks, telemetry, industrial monitoring, remote control systems, and educational electronics projects.

Operating from a 3.3V supply (2.7V-4.2V operating range), the module features a standard 6-pin interface for easy connection to microcontrollers. The default UART baud rate is 9600 bps, with configurable communication settings to suit various applications.

The HC-05 supports both Master Mode, allowing it to initiate connections with other Bluetooth devices, and Slave Mode, where it accepts incoming connections from smartphones, tablets, or computers. This flexibility makes it suitable for a broad range of wireless communication projects.

The compact PCB design is easy to integrate into prototypes and production systems while maintaining low power consumption. It is compatible with numerous serial communication applications including wireless data logging, GPS interfaces, smart metering, automation equipment, and remote monitoring systems.

Please Note: This version does not include the full AT Command firmware. Certain AT commands, such as password modification commands (AT+PSWD), are not supported and may return NO KEY or FAIL responses.

Features

Bluetooth V2.0 + EDR wireless communication

Supports both Master and Slave modes

CSR Bluetooth chipset

Transparent UART serial communication

6-pin interface for easy MCU connection

Operating voltage: 2.7V-4.2V (3.3V nominal)

Default baud rate: 9600 bps

Configurable UART communication settings

Low power consumption

Compact PCB design

Reliable wireless serial data transmission

Easy integration into embedded systems

Compatible with numerous microcontroller platforms

Specifications

Module: HC-05

Bluetooth Version: Bluetooth V2.0 + EDR

Operating Mode: Master / Slave

Chipset: CSR Bluetooth Chip

Operating Voltage: 2.7V-4.2V DC

Nominal Voltage: 3.3V DC

Default Baud Rate: 9600 bps

Operating Current: Approx. 30mA

Communication Current: Approx. 8mA

Communication Interface: UART (TTL Serial)

Pins: 6

Module Dimensions: 38.8 × 15.7 × 2.35mm

Applications

Arduino projects

ESP32 communication

STM32 development

PIC microcontroller projects

AVR development

Raspberry Pi UART communication

Robotics

Wireless sensor networks

Home automation

Industrial automation

GPS communication

Smart metering

Remote monitoring

Data logging

Wireless serial communication

Educational electronics

IoT prototypes

Important Note

This module does not include the Full AT Command firmware. Certain advanced AT commands, including password modification (AT+PSWD), are not supported and may return NO KEY or FAIL responses. Basic serial communication and Master/Slave functionality remain fully operational.

Benefits

The HC-05 Bluetooth Module provides a simple and cost-effective method of adding wireless serial communication to embedded systems. Supporting both Master and Slave modes, it offers exceptional flexibility for robotics, automation, and IoT applications while maintaining low power consumption and straightforward UART integration.

What's in the box
1 x BMT HC-05 Bluetooth Module 6-Pin V2.0 Master Slave 3.3V for Arduino MCU