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Arduino Bluetooth Module HC-05

Reference RBD-0905

HC-05 Bluetooth Module (CSR Chip) with Master/Slave mode support.
Bluetooth v2.0 + EDR, compatible with most microcontrollers and devices.
UART Serial Communication with default baud rate 9600 bps.
Wireless Range up to 10 Meters using Class 2 emission.
Reliable GFSK Modulation and Strong Signal Sensitivity (–84dBm at 0.1% BER).
Supports Embedded Projects, IoT Systems, and Wireless Communication.

This module uses a CSR chip of unknown origin, which may be a clone. However, it is still expected to perform reliably.
For a Bluetooth module with a verified genuine CSR chip (HC-05), click here.

Description
Product Details

Description

The HC-05 Bluetooth Module (CSR Chip) is a versatile and compact wireless communication module designed for seamless integration with microcontrollers like Arduino, Raspberry Pi, and more. Unlike HC-06, the HC-05 supports both Master and Slave modes, making it suitable for a wide range of serial communication applications. It operates on Bluetooth v2.0 + EDR protocol using the reliable GFSK modulation technique for strong and stable data transmission. The module communicates via UART and comes preconfigured with a default baud rate of 9600 bps. Whether you're developing wireless data transfer solutions, remote control systems, or embedded Bluetooth applications, the HC-05 offers dependable performance with a range of up to 10 meters in open space. Featured By RoboticsBD.

Product Images are shown for illustrative purposes only and may differ from the actual product.

The HC Bluetooth module is an older design and may not be compatible with the latest Android or iOS devices. For reliable operation, please use it with an older Android/iOS device, or alternatively use a BLE scanner app to detect and connect to the module.

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Features:

Supports Master and Slave Modes – Highly adaptable for different wireless setups.
Bluetooth v2.0 + EDR Compliance for fast and secure data transmission.
Default UART Baud Rate of 9600 bps, user-configurable via AT commands.
Integrated CSR Bluetooth Chip with high performance and power efficiency.
Low Power Consumption – Matching communication current: 8mA.
Strong Signal Sensitivity with –84dBm at 0.1% BER.
Wireless Range up to 10 Meters in open environments.
Compact PCB Design (43mm x 16.5mm x 7mm) with onboard status LEDs.
Compatible with Arduino, STM32, ESP32, Raspberry Pi, and other MCUs.
Widely Used in IoT, GPS, Industrial Automation, and Robotics Projects.

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Applications:

Embedded Wireless Communication between microcontrollers and mobile devices.
Bluetooth-Enabled Robotics for real-time remote control.
IoT Data Transmission and Monitoring applications.
GPS Receivers and Bluetooth-enabled tracking systems.
Wireless Serial Logging for industrial and consumer electronics.
Bluetooth-Controlled Home Automation like lights, fans, and appliances.
Educational and DIY Electronics Projects involving serial data exchange.

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General Specifications
Model	HC-05
Bluetooth Version	v2.0 + EDR
Operating Mode	Master / Slave
Frequency	2.4GHz ISM Band
Modulation	GFSK
Emission Power	≤ 4dBm, Class 2
Sensitivity	≤ -84dBm at 0.1% BER
Operating Voltage	3.6V – 6V DC
Operating Current	30–50mA
Communication Interface	UART (TXD, RXD)
Default Baud Rate	9600 bps
Operating Range	Up to 10 meters (open space)
Communication Speed	Async: 2.1Mbps / 160 kbps; Sync: 1Mbps
Security	Authentication and Encryption
Operating Temperature	-20°C to +75°C
Dimensions (LxWxH)	43mm x 16.5mm x 7mm
Weight	5g
Shipment Weight	0.01 kg
Shipment Dimensions	5 × 3 × 1 cm

Please allow 5% measuring deviation due to manual measurement.

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Documentation:

Original CSR Chip vs Clone – What’s the Difference?

One of the easiest ways to spot the difference between an original HC-05 module and a clone lies in the Bluetooth chip size and quality.

The original HC-05 uses a genuine CSR chip, which is slightly larger and provides more reliable Bluetooth communication, better range, and full AT command support.

Clone versions often come with smaller, unbranded chips, even falsely labeled as "CSR". These clones may lack proper protocol support, have limited AT commands, and exhibit unstable or slow connections.

Why Choose the Original HC-05?

Backed by a reliable CSR chipset
Better signal stability and communication range
Compact and easy to integrate into projects
Ideal for Arduino and microcontroller applications
Full support for configuration and firmware upgrades

CSR Chip vs Clone (Chip Differences)

Feature	CSR Chip (Genuine)	Clone CSR Chip (Chinese or non-genuine)
Chipset	Original CSR (Cambridge Silicon Radio) UK chip	Copy or alternative low-cost chipset
Stability	High – better signal strength, less dropout	Lower – occasional pairing issues or dropouts
AT Command Reliability	Fully supported and well-documented	Sometimes inconsistent AT command behavior
Firmware Upgradability	Often upgradeable	Often locked or unreliable firmware
Price	Slightly higher	Cheaper

Summary of Bluetooth Modules available in RoboticsBD

Module Name	HC Type	Chip Quality	Key Notes
1. HC-05 CSR Chip	HC-05	Generic CSR	May be reliable if true CSR, but unverified origin
2. HC-05 Genuine CSR Chip	HC-05	Genuine	Best quality among HC-05, fully supports Master/Slave
3. HC-05 Clone CSR Chip	HC-05	Clone	Might face instability, but works for basic use
4. HC-06 CSR Chip	HC-06	Generic CSR	Slave only, check CSR chip authenticity
5. HC-06 Genuine CSR Chip	HC-06	Genuine	Best among HC-06, reliable slave communication
6. HC-06 Clone CSR Chip	HC-06	Clone	Basic functionality, lower reliability

Which Should You Use?

For advanced control (Master/Slave, Arduino to Arduino):

→ HC-05 Genuine CSR Chip

For simple, reliable communication (e.g., Arduino to Android):

→ HC-06 Genuine CSR Chip

For budget or experiments:

→ Clone modules are fine, but test each thoroughly.

Package Includes:

1 x Arduino Bluetooth Module HC-05 - CSR Chip

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Product Details

Reference RBD-0905

In stock 93 Items

Specific References

EAN13: 0905

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