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HC-05 Bluetooth Serial Transceiver Module – 6-Pin Dual Mode (Master/Slave) Wireless Connector with Reset Button for Arduino and ESP32

HC-05 Bluetooth Serial Transceiver Module – 6-Pin Dual Mode (Master/Slave) Wireless Connector with Reset Button for Arduino and ESP32

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ComponentSpecification
ModelHC-05 (Dual Mode)
Bluetooth VersionV2.0 + EDR
Operating Voltage3.6V to 6V DC
ModesMaster and Slave
Baud Rate9600 (Data), 38400 (AT Mode)
InterfaceUART (6-Pin Breakout)
                                 Price

🚚 Ships within 24 Hours
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₹ 203.39 ₹ 203.39
(Tax included)

Barcode: 6466

Product Description The HC-05 Bluetooth Serial Transceiver Module is a highly versatile wireless communication tool that sets itself apart by offering both Master and Slave modes. Unlike the slave-only HC-06, the HC-05 can initiate connections with other Bluetooth devices, making it the perfect choice for peer-to-peer communication between two microcontrollers. It comes mounted on a 6-pin breakout board that includes a dedicated reset button and a 'State' pin for easy monitoring. Designed for seamless UART serial communication, it is fully compatible with Arduino, ESP32, and Raspberry Pi, providing a reliable wireless bridge for robotics, home automation, and remote data acquisition.

Key Features

  • Dual Mode Versatility: Can be configured as either a Master or a Slave device via simple AT commands.

  • Integrated Reset Button: Features an on-board button to easily enter AT command mode for configuration.

  • 6-Pin Breakout: Provides access to VCC, GND, TXD, RXD, State, and EN (Enable) pins for full control.

  • Master-Slave Pairing: Capable of searching for and connecting to other Bluetooth modules (like HC-05 slave or HC-06) automatically.

  • Transparent Communication: Once paired, it acts as a simple wireless serial cable, transferring data byte-for-byte without complex overhead.

Technical Details

  • Core Chipset: Based on the CSR BC04 Bluetooth technology with a built-in 2.4GHz PCB antenna.

  • Transmit Power: Class 2 power level with a range of approximately 10 meters in open space.

  • Default Settings: Ships with a default baud rate of 9600, 8 data bits, 1 stop bit, and no parity.

  • AT Command Mode: Uses 38400 baud rate for configuration; accessible by holding the button during power-up.

  • Operating Current: Draws 30-40mA during pairing and drops to approximately 8mA once a connection is established.

  • Logic Level: UART pins operate at 3.3V; the module includes an on-board regulator to handle 5V VCC input.

  • Sensitivity: Excellent receiver sensitivity of -80dBm for stable data transfer even at range limits.

  • Modulation: Uses GFSK (Gaussian Frequency Shift Keying) for robust signal integrity.

  • Frequency Band: Operates on the standard 2.4GHz ISM band.

  • State Pin: High output when connected, allowing microcontrollers to monitor link status in real-time.

  • EN Pin: Can be pulled low to put the module into a low-power sleep mode to save energy.

  • Security: Supports simple pairing and encrypted data transmission; default PIN is usually 1234.

  • Dimensions: Standard size of 28mm x 15mm x 2.35mm, fitting easily into compact project housings.

  • PCB Quality: High-quality industrial-grade PCB with clear silk-screen labeling for error-free wiring.

  • Environmental Tolerance: Reliable operation in temperatures ranging from -20°C to +75°C.

Prototyping and Engineering Tips from Robogears

  • 9V Battery Use: Do not connect 9V directly to the module. Ensure you use the 5V regulated output from your Arduino to power the VCC pin.

  • 18650 Cell: A single 18650 cell is an excellent power source. For the best stability, we suggest using a 10uF capacitor across the power pins to filter out noise.

  • Resistor IC Tip: Since the RX pin is 3.3V logic, always use a voltage divider (1k and 2k resistors) when connecting to a 5V Arduino TX pin to protect the module.

  • Related Products: We recommend using this with our Arduino Uno R3, Logic Level Converters, and Bluetooth Terminal Apps for smartphone testing.

Package Includes

  • 1 x HC-05 6-Pin Bluetooth Module (Master/Slave).

Disclaimer Image is for illustration purpose only 2-3 lines. Always disconnect the module from the RX/TX pins of your Arduino while uploading code to prevent serial port conflicts.

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