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Arduino Bluetooth Module HC-05 Local CSR Chip Robotics Bangladesh

Arduino Bluetooth BLE Module HC-05 Local Chip

Reference RBD-3438

HC-05 Bluetooth Module (Local CSR Chip) with Master/Slave mode support.
Operates on Bluetooth v2.0 + EDR, suitable for basic wireless serial communication.
Clone version, may have reduced stability but is ideal for general-purpose use.
UART-based communication with default baud rate 9600 bps.
Compact 6-pin design, easily integrates with Arduino, ESP32, STM32, etc.
Works up to 10 meters in open space – ideal for short-range control projects.

This module uses a Local-clone chip.
However, for a Bluetooth module with a verified genuine CSR chip (HC-05), click here.

Description
Product Details

Description

The HC-05 Bluetooth Module with Local CSR Chip is a cost-effective wireless communication solution designed for beginner to intermediate projects. Supporting both Master and Slave modes, this module is ideal for wireless serial data exchange between microcontrollers and Bluetooth-enabled devices like PCs or smartphones. Though this version uses a clone/local CSR chip, making it slightly less stable than the original, it still functions reliably for standard Arduino and embedded applications.

It operates on Bluetooth v2.0 + EDR protocol, using GFSK modulation, and provides a communication range of up to 10 meters. It’s perfect for budget-conscious hobbyists looking to integrate Bluetooth into their microcontroller projects. Featured By RoboticsBD.

You need to use a BLE scanner app to detect and connect to the module.

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

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Features:

Supports both Master and Slave Modes for flexible usage.
Bluetooth v2.0 + EDR, suitable for wireless serial data communication.
Clone CSR chip – affordable but might be less stable than the original.
UART serial communication; default baud rate: 9600 bps.
Class 2 emission, range up to 10 meters in open space.
LED indicators for power and Bluetooth pairing status.
Compact and breadboard-friendly design (43mm x 16.5mm).
Compatible with Arduino, Raspberry Pi, ESP32, STM32, and other MCUs.
Low power consumption (30mA pairing, 8mA during communication).
Great for DIY automation, data logging, and wireless control systems.

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Applications:

Arduino Wireless Control (e.g., robot car, smart lights).
Serial Data Logging with Bluetooth to smartphone or PC.
Home Automation Projects with Bluetooth interface.
IoT Prototyping on a budget.
Wireless communication between two microcontrollers.
Bluetooth remote control in robotics and automation.
Educational setups to teach UART and wireless basics.

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General Specifications
Model	HC-05 (Local CSR Chip)
Chip Type	Clone/Local CSR
Bluetooth Version	v2.0 + EDR
Modes	Master / Slave
Frequency	2.4GHz ISM Band
Modulation	GFSK
Emission Power	≤4dBm, Class 2
Sensitivity	≤-84dBm at 0.1% BER
Voltage Range	3.6V – 6V DC
Default Baud Rate	9600 bps
Operating Current	30mA (pairing), 8mA (active)
Communication Interface	UART (TXD, RXD)
Max Range	10 meters (open space)
Temperature Range	-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 Local CSR Chip

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Product Details

Reference RBD-3438

In stock 234 Items

Specific References

EAN13: 3438

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