The HC-06 Bluetooth Module (Local CSR Chip) is a compact and cost-effective solution to add wireless serial communication to your Arduino or microcontroller projects. It operates strictly in Slave mode, making it ideal for receiving data from smartphones or other Bluetooth master devices.
Built with a local/clone CSR BC04 chip, it provides basic stability and compatibility at a lower price point—perfect for students, hobbyists, or budget-conscious makers. It comes with an onboard 2.4GHz PCB antenna, offers a communication range of up to 10 meters, and operates via a standard UART interface (TXD, RXD, VCC, GND).
Its wide voltage range (3.3V to 6V) and compact size make it easy to integrate into existing projects without the need for additional power regulation or antenna modules. Featured By RoboticsBD.
This Bluetooth module 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:
Bluetooth 2.0 + EDR protocol for simple serial data communication
Slave Mode Only – receives data from smartphones, PCs, or master devices
Based on local CSR BC04 chip – ideal for basic and budget projects
Built-in 2.4GHz PCB antenna for compact size and wireless convenience
Default baud rate 9600 bps, configurable via AT commands
Supports 3.3V – 6V input, no external regulator required
Low power consumption: 30–40mA pairing, 8–10mA while connected
Simple 4-pin UART interface: VCC, GND, TXD, RXD
Compatible with Arduino, ESP32, STM32, Raspberry Pi and more
Compact size (27mm x 13mm x 2.2mm) – fits tight builds and enclosures
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Applications:
Arduino Wireless Control – robot cars, remote switches, smart gadgets
Data Logging – wirelessly collect sensor data to a smartphone or PC
Bluetooth-based Robotics – control robotic movement from your phone
Home Automation – control lights, appliances, or fans wirelessly
IoT Prototyping – basic Bluetooth-based IoT communication
Educational Projects – teach students wireless serial communication
Budget DIY Projects – great entry-level module for beginners
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| General Specifications |
| Model | HC-06 (Slave Mode Only) |
| Chipset | Clone CSR BC04 |
| Bluetooth Version | 2.0 + EDR |
| Operating Voltage | 3.3V – 6V |
| Recommended Voltage | 3.3V |
| Communication Interface | UART (TXD, RXD, VCC, GND) |
| Default Baud Rate | 9600 bps |
| Current – Pairing | 30 – 40 mA |
| Current – Connected | 8 – 10 mA |
| Wireless Range | Up to 10 meters (open space) |
| Communication Format | 8 data bits, 1 stop bit, no parity |
| Antenna | Built-in 2.4GHz PCB |
| 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 Local CSR Chip
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