HC-05 Bluetooth Module with TTL Output

HC-05 Bluetooth Module with TTL Output enables reliable wireless communication between microcontrollers and embedded systems. Developers use it to add Bluetooth connectivity to Arduino, Raspberry Pi, and other serial-based hardware projects with ease.

Key Features:

• Bluetooth 2.0 + EDR Support: Provides stable and fast serial communication.
• TTL-Level UART Interface: Works directly with 3.3 V or 5 V microcontroller UART pins.
• Configurable Roles: Operates as master or slave through AT commands.
• Built-in Antenna: Ensures strong and reliable wireless range.
• Easy Integration: Plug-and-play with Arduino, STM32, and Raspberry Pi boards.
• Low Power Consumption: Designed for energy-efficient communication.

Technical Specifications:

• Bluetooth Protocol: Bluetooth v2.0 + EDR (Enhanced Data Rate)
• Operating Voltage: 3.6 V – 6 V DC (typically powered at 5 V)
• Logic Level: TTL 3.3 V for RX/TX pins
• Default Baud Rate: 9600 bps (configurable using AT commands)
• Operating Current: ~30 mA (active mode)
• Communication Range: Up to 10 meters (line of sight)
• Modulation: GFSK (Gaussian Frequency Shift Keying)
• Operating Temperature: –25 °C to +75 °C

Mechanical Specifications:

• Module Type: HC-05 breakout board with onboard antenna
• PCB Material: FR-4 standard green solder mask
• Connector Pins: 6-pin male header (straight or angled, depending on supplier)
• Onboard LED: Status indicator for pairing and connection

Dimensions:

• Length: ~37 mm
• Width: ~15 mm
• Height: ~3 mm (excluding header pins)
• Pin Pitch: 2.54 mm (standard breadboard spacing)

Pinout and Wiring:

• Pin 1 – EN/KEY: Enables AT command mode when pulled HIGH
• Pin 2 – VCC: Power input (3.6 V – 6 V)
• Pin 3 – GND: Ground
• Pin 4 – TXD: Transmit data output (connect to MCU RX)
• Pin 5 – RXD: Receive data input (connect to MCU TX, use voltage divider if MCU is 5 V)
• Pin 6 – STATE: Outputs HIGH when connected via Bluetooth

Datasheet Reference:

• Refer to the official HC-05 datasheet and AT command set guide for configuration and detailed electrical specifications.

Applications:

• Wireless Data Communication: Add Bluetooth serial communication between devices.
• Arduino and DIY Projects: Enable wireless control of Arduino-based robots and automation systems.
• PC to Microcontroller Communication: Use with USB Bluetooth dongles to communicate wirelessly with microcontrollers.
• IoT Devices: Integrate into smart home systems for wireless sensor and control nodes.

Equivalent Models:

• HC-06: Slave-only Bluetooth module with similar form factor.
• JDY-30: Alternative Bluetooth 2.0 module with UART interface.
• HC-08: Bluetooth 4.0 BLE module (for low-energy applications).

Package Includes:

• 1 x HC-05 Bluetooth Module with TTL Output