HC-05 Bluetooth Module – Serial Wireless Transceiver
The HC-05 is a class 2 Bluetooth module designed for transparent wireless serial communication. It is pre-configured as a slave Bluetooth device. Once it is paired to a master Bluetooth device such as PC, smart phones and tablet, its operation becomes transparent to the user. HC-05 Bluetooth Serial Module enables wireless communication between microcontrollers like Arduino or Raspberry Pi and smartphones or PCs. Ideal for IoT, robotics, and DIY wireless control applications.
₹ 249 ₹299
299
Sparkfun Detailed Product Description:
The HC-05 Bluetooth Module is a popular and cost-effective Bluetooth SPP (Serial Port Protocol) module designed for transparent wireless serial communication. It supports both Master and Slave modes, making it versatile for a variety of wireless applications.
It operates over Bluetooth 2.0+EDR, offering stable, secure, and long-range communication with mobile devices and PCs. Interfacing is simple via UART (TX, RX) pins, and it’s fully compatible with Arduino, ESP32, Raspberry Pi, and other microcontrollers.
Whether you're building a Bluetooth-controlled robot, home automation system, or IoT device, the HC-05 module is your go-to for easy Bluetooth connectivity.
Key Features:
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Wireless Bluetooth serial communication module
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Works in Master and Slave modes
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Built-in 3.3V regulator
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Supports AT commands for configuration
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Ideal for Arduino, Raspberry Pi, ESP32, STM32
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Used in IoT, robotics, and Bluetooth control projects
Technical Specifications:
| Parameter | Specification |
|---|---|
| Bluetooth Version | 2.0 + EDR (Enhanced Data Rate) |
| Operating Voltage | 3.3V–6V (recommended 5V with level shifter) |
| Logic Level | 3.3V |
| Baud Rate (Default) | 9600 bps |
| Communication | UART (TX/RX) |
| Range | ~10 meters (open space) |
| Modes | Master / Slave |
| Dimensions | ~37 mm × 15 mm |
| LED Indicator | Power and connection status |
How to Use with Arduino:
Wiring (with voltage divider for RX):
| HC-05 Pin | Arduino Pin |
|---|---|
| VCC | 5V |
| GND | GND |
| TXD | D10 |
| RXD | D11 (via 1kΩ–2kΩ voltage divider) |
Sample Arduino Code:
Applications:
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Bluetooth-controlled robots and vehicles
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Wireless home automation systems
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IoT device communication
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Serial communication with mobile apps
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Wireless sensor data logging
Package Includes:
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1 × HC-05 Bluetooth Module with onboard LED indicator
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