The HC-05 Bluetooth Module (6 Pin) with Original CSR Chip is a premium wireless communication solution for serial data transfer between microcontrollers and Bluetooth-enabled devices. Featuring the genuine Cambridge Silicon Radio (CSR) BC417 chipset, this module ensures stable, fast, and secure communication, supporting Bluetooth 2.0 + EDR standards. Unlike clone modules, the original HC-05 supports full AT command functionality, and can operate in both Master and Slave modes, making it a versatile choice for advanced Bluetooth applications. Whether you're building Arduino-based automation, wireless sensor networks, or remote-controlled systems, the HC-05 delivers superior compatibility, long-range stability, and reliable performance. Ideal for developers seeking dependable Bluetooth connectivity in embedded systems. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
Powered by Original CSR BC417 Chip – ensures authenticity, better range, and full AT command support.
Dual Mode Support (Master/Slave) – fully configurable for dynamic communication roles.
Bluetooth 2.0 + EDR Support – low energy consumption with high-speed data transmission.
Wide Operating Voltage (3.3V to 6V) – includes onboard regulator for easy interfacing with microcontrollers.
6-Pin UART Interface: VCC, GND, TXD, RXD, KEY, STATE for flexible integration and debugging.
Stable Wireless Communication – up to 10 meters range in open environments.
LED Indicators for Bluetooth power and connection status.
Compact and Durable Design suitable for embedded and mobile systems.
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Applications:
Arduino and Raspberry Pi Wireless Projects for sensor data or control signals.
Bluetooth Remote Control Systems for robotics, relays, or home automation.
Wireless Serial Communication between microcontrollers and PCs or smartphones.
IoT Projects requiring Bluetooth data acquisition and control.
Home Automation Systems involving Bluetooth-based inputs and outputs.
Wireless Programming or Debugging of embedded devices.
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| General Specifications |
| Chipset | CSR BC417 Original |
| Bluetooth Version | v2.0 + EDR |
| Frequency Band | 2.4GHz ISM |
| Operating Voltage | 3.3V – 6V (with onboard regulator) |
| Communication Interface | UART Serial |
| Default Baud Rate | 9600 bps (configurable via AT commands) |
| Modes | Master and Slave |
| Communication Range | Up to 10 meters (open space) |
| Pinout | VCC, GND, TXD, RXD, KEY, STATE |
| LED Indicators | Power and pairing status |
| Compatibility | Arduino, Raspberry Pi, ESP32, STM32 |
| Dimensions | Compact 6-pin module |
| Shipment Weight | 0.0047 kg |
| Shipment Dimensions | 6 × 4 × 3 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
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 Original CSR Chip
