HC-05 Bluetooth Module with TTL Output

HC-05 Bluetooth Module with TTL Output is a versatile wireless communication module that enables serial data transmission between devices via Bluetooth 2.0+EDR technology. With its built-in 3.3V regulator and TTL-level UART interface, it’s ideal for Arduino projects, wireless data logging, and IoT applications.

Key Features of HC-05 Bluetooth Module:

• • Bluetooth 2.0+EDR: Supports both master and slave modes
  • TTL Serial Interface: Direct connection to microcontrollers
  • Built-in Voltage Regulator: 3.3V operation with 5V tolerant inputs
  • Configurable Baud Rate: 9600-1382400bps (default 38400bps)
  • LED Status Indicator: Visual feedback for connection status

Technical Specifications:

• • Bluetooth Version: 2.0+EDR (Enhanced Data Rate)
  • Operating Voltage: 3.6-6V DC (5V recommended)
  • Communication Range: Up to 10 meters (open space)
  • Current Consumption: 30mA (operating), <1mA (sleep)
  • UART Interface: TTL level (3.3V logic)
  • Frequency: 2.4GHz ISM band
  • Dimensions: 36mm × 15mm × 11mm

Pin Configuration:

• • VCC: Power input (3.6-6V DC)
  • GND: Ground connection
  • TXD: Transmit data (3.3V TTL)
  • RXD: Receive data (3.3V TTL)
  • STATE: Connection status indicator
  • EN/KEY: Mode control (AT command mode when high)

Connection Guide:

• • Arduino Connection:
    • HC-05 VCC → Arduino 5V
    • HC-05 GND → Arduino GND
    • HC-05 TXD → Arduino RX (pin 0)
    • HC-05 RXD → Arduino TX (pin 1) with voltage divider
  • Important Notes:
    • Use 1kΩ+2kΩ resistor divider for 5V to 3.3V conversion
    • Disconnect during programming to avoid interference
    • Default pairing code: “1234”

AT Command Mode Configuration:

• • 1. Power on while holding EN/KEY pin high
  • 2. Send “AT” (should return “OK”)
  • 3. Common commands:
    • AT+NAME? – Check device name
    • AT+PSWD? – Check pairing code
    • AT+UART? – Check baud rate

Applications:

• • Wireless Data Transfer: Serial communication between devices
  • Arduino Projects: Remote control and monitoring
  • IoT Devices: Wireless sensor networks
  • Robotics: Bluetooth-controlled robots
  • DIY Electronics: Home automation systems

Equivalent Modules:

• • HC-06: Slave-only version
  • JDY-31: Bluetooth 4.0 alternative

Datasheet:

• • Download HC-05 Datasheet

Keywords:

• • HC-05 Bluetooth Module
  • Bluetooth Serial Module
  • TTL Bluetooth Transceiver
  • Arduino Bluetooth Module
  • Wireless Serial Communication

Package Includes:

• • 1 x HC-05 Bluetooth Module with TTL Output