hc 05 bluetooth module

HC-05 Bluetooth Serial Transceiver Module (Master/Slave)

Overview: Add wireless communication to your microcontroller projects seamlessly with the HC-05 Bluetooth Module. Designed for makers, students, and engineers, this versatile module allows your Arduino, Raspberry Pi, or custom PCB to communicate wirelessly with smartphones, laptops, and other Bluetooth-enabled devices. Featuring dual Master and Slave mode operation, it provides a stable and reliable Serial Port Protocol (SPP) connection, making it an indispensable component for robotics, smart home automation, and remote control systems.

Key Features:

1. Dual Mode Capability (Master/Slave): Can be configured as either a Master device (to initiate connections) or a Slave device (to accept incoming connection requests).
2. Seamless Wireless Serial Communication: Converts traditional wired UART serial communication into a wireless Bluetooth signal with zero hassle.
3. Easy AT Command Configuration: Built-in Key/EN pin allows you to easily modify settings like device name, baud rate, and pairing passcode using standard AT commands.
4. Wide Compatibility: Plugs directly into Arduino, STM32, PIC, ESP32, and Raspberry Pi via standard 4-pin/6-pin header interfaces (VCC, GND, TXD, RXD).
5. Onboard LED Indicator: Provides quick visual status for pairing mode, active connection, and power state.

Technical Specifications:

1. Model: HC-05
2. Bluetooth Protocol: Bluetooth v2.0 + EDR
3. Frequency: 2.4 GHz ISM Band
4. Operating Voltage: 3.6V – 6V (Onboard voltage regulator)
5. Logic Level: 3.3V UART (Requires resistor divider/level shifter when connecting 5V TX/RX pins)
6. Range: ~10 Meters (Open space)
7. Baud Rate Default: 9600 (Data mode) / 38400 (Command mode)
8. Default Passcode: 1234 or 0000

Common Applications:

1. Smartphone-controlled Arduino Robots
2. Smart Home Automation & IoT projects
3. Wireless Sensor Data Logging
4. Remote Industrial Control Systems