HC-05 is a Bluetooth module that connects to the serial port of a microcontroller, allowing the microcontroller to communicate with other devices via Bluetooth. The module itself can operate in master and slave modes and can be used for various applications, such as smart home applications, remote control, data logging applications, robotics,monitoring systems, etc. The HC-05 embedded Bluetooth serial communication module (hereinafter referred to as the module) has two operating modes: command response mode and automatic connection mode. In automatic connection mode, the module can be divided into three working roles: master, slave, and loopback. When the module is in automatic connection mode, it will automatically connect based on the predefined data transmission method; when the module is in command response mode, it can execute all the AT commands listed below, allowing users to send various AT commands to set control parameters or issue control commands to the module. By controlling the external pin (PIO11) input level of the module, dynamic conversion of the module’s working state can be achieved. The following image shows the actual HC-05 Bluetooth module.
The main function of HC-05 is to add bidirectional (full-duplex) wireless capability to projects. It can be used for communication between two microcontrollers with serial capabilities (such as twoArduinos), but it can also be used to control any Bluetooth device through a microcontroller, and vice versa.HC-05 supports standard AT commands through the TX and RX pins. To do this, the user must enter a special command mode when the device starts. This is accomplished by pulling the key pin low when powering on the module. Otherwise, the device will start in data mode, allowing it to communicate wirelessly with other devices.After the module starts, any Bluetooth device (such as a smartphone) should be able to discover it and connect to the device using the standard password. Once connected, data is transmitted through the HC-05 and converted into a serial stream, which is then read by the microcontroller connected to the module. The method of sending data from the microcontroller is the reverse. The following image shows the schematic diagram of the HC-05 Bluetooth module.
Finally, sharing materials related to the Bluetooth module, the screenshot of the materials is shown in the following image.
HC-05 Bluetooth module material Baidu Cloud download link:https://pan.baidu.com/s/1Q8IwJ3f8GwYNHorEcB31FwExtraction code: s7hu
