HC-06 4Pin Bluetooth Module Master and Slave

HC-06 4Pin Bluetooth Module (Master/Slave Configuration) provides a highly cost-effective and reliable solution for establishing short-range wireless serial communication in embedded projects. This module utilizes the robust Bluetooth 2.0 protocol with the Serial Port Profile (SPP), enabling seamless data exchange between microcontrollers and Bluetooth-enabled devices like smartphones or PCs. The HC-06 typically operates as a Slave device, allowing external devices to initiate a connection to it. However, many vendors flash the module to allow both Master and Slave modes, offering flexibility to either accept connections or initiate pairing with other modules. Consequently, engineers use the HC-06 widely for remote control, data logging, and IoT prototyping, where its low power consumption and easy-to-use AT command set make implementation straightforward.

Key Features:

• Bluetooth Protocol: Compliant with Bluetooth V2.0+EDR (Enhanced Data Rate) standard, ensuring quick and stable connections.
• Serial Port Profile (SPP): The module implements SPP, which allows for a virtual RS-232 serial cable replacement over the air.
• Operating Mode: Configurable for both Master (Initiate connections) and Slave (Accept connections) roles, although often shipped primarily as Slave.
• Low Power Consumption: Features low operating current, making it ideal for battery-powered or energy-sensitive portable applications.
• AT Command Set: Users can easily configure the baud rate, pairing key, and module name via simple AT commands sent through the serial port.
• Built-in Regulator: The module board includes a 3.3V voltage regulator, allowing it to be safely powered directly from 5V microcontrollers like Arduino.

Technical Specifications:

• Bluetooth Version: V2.0+EDR
• Frequency Band: 2.4 GHz ISM Band
• Modulation: GFSK (Gaussian Frequency Shift Keying)
• Operating Voltage: 3.3 V DC (Logic Level) or 3.6 V to 6 V DC (Module Board Input)
• Maximum TX Power: +4 dBm (Class 2)
• Operating Range: Up to 10 meters (Line of sight)
• Default Baud Rate: 9600 bps or 38400 bps (Configurable)
• Interface: Standard UART (Serial)

Mechanical Specifications:

• Board Dimensions: ≈ 37 mm × 17 mm
• Antenna Type: On-board PCB antenna
• Mounting: 4 through-hole pins for easy integration into breadboards or soldered PCBs.
• Indicator LED: Features an LED that indicates connection status (fast blink for waiting to pair, slow blink or solid for connected).

Dimensions:

• PCB Length: ≈ 37.0 mm
• PCB Width: ≈ 17.0 mm
• Board Weight: ≈ 4 g (Lightweight for portable applications)
• Pin Count: 4 Pins (VCC, GND, TXD, RXD)

Pinout and Wiring:

• VCC: Connect this pin to the power supply (3.6 V to 6 V DC, typically 5V from Arduino).
• GND: Connect this pin to the common ground of the circuit (0 V).
• TXD (Transmit): Connect this pin to the microcontroller’s RX (Receive) pin.
• RXD (Receive): Connect this pin to the microcontroller’s TX (Transmit) pin. Note that 5V microcontrollers often require a voltage divider on the RXD pin because the HC-06 logic level is 3.3V.

Datasheet Reference:

• Download HC-06 Bluetooth Module Datasheet (Reference)

Commonly Used in:

• Arduino and Raspberry Pi Projects: Providing basic wireless communication for microcontrollers.
• Robot Control Systems: Enabling wireless remote control of mobile robots and vehicles via a smartphone.
• Data Acquisition: Logging sensor data wirelessly to a PC or mobile device.

Applications:

• Wireless Serial Bridge: Replacing physical UART cables for device configuration and debugging.
• Home Automation: Controlling relays, lights, and other appliances via a Bluetooth app.
• Custom Peripherals: Creating custom Bluetooth keyboards, mice, or game controllers interfaced with a microcontroller.
• IoT Prototyping: Serving as the wireless connectivity layer for simple Internet of Things prototypes.

Equivalent Models:

• HC-05: A more advanced module that is fully configurable as Master or Slave via AT commands, although the HC-06 is simpler for dedicated Slave applications.
• JY-MCU (Sometimes used interchangeably): Another common breakout board featuring the same core Bluetooth chip, offering identical functionality.
• JDY-31: A newer, lower-power Bluetooth 3.0 module that provides a modern, pin-compatible alternative.

Package Includes:

• 1 x HC-06 4Pin Bluetooth Module (Mounted on Breakout Board)