Bluetooth Module HC-05:

Here are some key features and considerations for the HC-05 Bluetooth module:

1. Bluetooth Version: The HC-05 module is based on Bluetooth technology. It supports Bluetooth 2.0 and Enhanced Data Rate (EDR), providing a reliable and efficient wireless communication protocol.
2. Operating Modes:
   • Master Mode: The module can act as a master device and connect to other Bluetooth devices (e.g., smartphones, computers).
   • Slave Mode: The module can act as a slave device and be connected to a master device (e.g., another HC-05 module or a Bluetooth-enabled device).
3. Serial Communication: The HC-05 module typically uses UART (Universal Asynchronous Receiver-Transmitter) communication for interfacing with microcontrollers or other devices. It simplifies the integration of Bluetooth capabilities into projects.
4. Baud Rate: The module supports adjustable baud rates for UART communication. It's important to set the baud rate on both the HC-05 module and the connected device to ensure proper communication.
5. Pairing: The module supports Bluetooth pairing for secure connections. In some configurations, it may require a passkey during the pairing process.
6. Configuration Modes:
   • Command Mode: Allows users to send AT commands to configure the module.
   • Data Mode: Enables data transmission once the module is configured.
7. AT Commands: The HC-05 module can be configured using AT commands to set parameters such as device name, pairing code, and operating mode. AT commands are sent via the UART interface.
8. Power Supply: The HC-05 module typically operates at 3.3V, but some modules may tolerate 5V. Care should be taken to provide the correct voltage to avoid damage.
9. Range: The effective range of communication between two HC-05 modules depends on the environment and obstacles. In open spaces, it can reach several meters.
10. LED Indicators: Some HC-05 modules have LED indicators to show the status of the module, such as power, connection, and data transmission.
11. Compatibility: The HC-05 is compatible with various microcontrollers, such as Arduino, Raspberry Pi, and other platforms. Libraries and sample code are available for easy integration.
12. Applications: HC-05 modules are used in applications such as wireless communication between microcontrollers, Bluetooth-enabled home automation systems, and remote control of devices.
13. Security: While the HC-05 supports basic Bluetooth security features, it's essential to be aware of potential security risks. Users should take precautions when using Bluetooth for sensitive applications.
14. Firmware Updates: Some HC-05 modules allow firmware updates, enabling users to benefit from bug fixes or new features released by the module's manufacturer.
15. Documentation: Refer to the datasheet and documentation provided by the manufacturer for detailed specifications, pin configurations, and AT command set.