The HC-05 Bluetooth module is a versatile and widely-used device for wireless communication. Here are some key details about it:

Specifications:

• Operating Voltage: 4V to 6V (typically 5V)
• Operating Current: 30mA
• Range: Up to 100 meters
• Bluetooth Protocol: Bluetooth v2.0+EDR (Enhanced Data Rate)
• Frequency: 2.4GHz ISM band
• Modulation: GFSK (Gaussian Frequency Shift Keying)
• Data Rate: Asynchronous: 2.1Mbps (Max) / 160 kbps, Synchronous: 1Mbps/1Mbps
• Security: Authentication and encryption
• Profiles: Serial Port Profile (SPP)
• Dimensions: 26.9mm x 13mm x 2.2mm

Pin Configuration:

1. Enable/Key: Toggles between Data Mode (low) and AT Command Mode (high).
2. Vcc: Powers the module (connect to +5V supply).
3. Ground: Connect to system ground.
4. TX (Transmitter): Transmits serial data.
5. RX (Receiver): Receives serial data.
6. State: Indicates the status of the module.
7. LED: Shows the module’s status (blinking patterns indicate different modes).
8. Button: Used to control the Key/Enable pin.

Modes of Operation:

• Data Mode: Used for normal communication.
• Command Mode: Used to configure the module using AT commands.

Default Settings:

• Bluetooth Name: “HC-05”
• Password: 1234 or 0000
• Baud Rate: 9600 (Data Mode), 38400 (Command Mode)

The HC-05 module is ideal for projects requiring wireless communication between microcontrollers (like Arduino) and Bluetooth-enabled devices (like smartphones)

Is there a specific project you’re planning to use the HC-05 for?