The HC-05 is a classic Bluetooth 2.0 module for wireless serial communication between microcontrollers and devices. Its 4-pin UART interface (TXD/RXD/VCC/GND) simplifies integration with Arduino/ESP projects.
Core Specs
Bluetooth: 2.0 + EDR (Classic)
Range: Up to 10m (open space)
Voltage: 3.3V-5V compatible
Interface: UART (TXD/RXD/VCC/GND)
Baud Rate: Default 38400bps (configurable)
Modes: Master + Slave (AT configurable)
Features
Chipset: BC417 CSR
LED Indicators: Power + Status
Pairing PIN: Default "1234"
Antenna: Integrated PCB
Size: 26mm × 15mm
Key Benefits
✔ Dual-mode - Works as Master/Slave
✔ Plug-and-play - Acts as wireless serial cable
✔ 5V tolerant - No level shifter needed
✔ AT commands - Configure name, PIN, baud rate
Typical Uses
Wireless sensor data transmission
Bluetooth robot/device control
Serial communication replacement
Pro Tip: Use 38400bps for AT commands!
Package Includes: 1 x HC-05 Bluetooth Module