The Arduino Bluetooth Module HC-06 (CSR Chip) is a compact and cost-effective solution for adding wireless communication to your microcontroller projects. Based on CSR BC04 Bluetooth technology, it operates as a Slave-only device, making it ideal for communication between an Arduino and smartphones or Bluetooth-enabled controllers. With a built-in 2.4GHz PCB antenna, it offers up to 10 meters of reliable wireless range. This module uses a UART serial communication interface and supports a voltage range from 3.3V to 6V, with a default baud rate of 9600 bps. Whether you’re building a remote-controlled robot, logging sensor data, or integrating home automation, the HC-06 provides stable and simple Bluetooth connectivity. Featured By RoboticsBD.
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.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
CSR BC04 Bluetooth Chipset for improved compatibility and performance.
Slave Mode Operation – communicates with master devices like smartphones or PCs.
Built-in 2.4GHz PCB Antenna for compact form factor and stable signal.
UART Interface with default 9600 bps for easy microcontroller connection.
Wide Voltage Support (3.3V – 6V) – includes onboard voltage regulator.
Low Power Consumption – approx. 30mA during pairing, 8–10mA when connected.
Compact Design (27mm x 13mm x 2.2mm) – fits in tight enclosures.
Reliable Communication Range up to 10 meters in open area.
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Applications:
Wireless Control of Arduino Projects from smartphones or Bluetooth-enabled devices.
Bluetooth-Based Robotics for controlling robot movement remotely.
Home Automation Systems – control lights, fans, and appliances wirelessly.
Wireless Sensor Data Logging to a phone, PC, or cloud platform.
Educational Use for teaching wireless communication and embedded systems.
DIY Projects where compact, low-cost Bluetooth connectivity is needed.
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| General Specifications |
| Model | HC-06 (Slave Mode Only) |
| Bluetooth Technology | CSR BC04 |
| Bluetooth Version | 2.0 + EDR |
| Operating Voltage | 3.3V – 6V |
| Recommended Operating Voltage | 3.3V |
| Operating Current (Pairing) | 30–40mA |
| Operating Current (Connected) | 8–10mA |
| Communication Interface | UART (VCC, GND, TXD, RXD) |
| Default Baud Rate | 9600 bps |
| Wireless Range | Up to 10 meters (open area) |
| Communication Format | 8 data bits, 1 stop bit, no parity |
| Antenna | Built-in 2.4GHz PCB antenna |
| Operating Temperature Range | -25°C to +75°C |
| Dimensions | 27mm × 13mm × 2.2mm |
| 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-06 module and a clone lies in the Bluetooth chip size and quality.
The original HC-06 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-06?
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-06
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