Bluetooth module HC-05, compatible

hc-05 bluetooth module, compatible with Arduino and other development boards. This module is used together with development boards for serial communication via Bluetooth. It can be used both as a Master and as a Slave.

This version uses the compatible HC-05 integrated, a cheaper but reliable version.

With two modules, wireless communication can be achieved between two microcontrollers such as Arduino or between a microcontroller and a Bluetooth device such as a phone or a computer.

Communication is carried out via USART at a baud rate of 9600. The data transfer capacity does not extend to music files or photos.

Important: The RX pin from the Arduino works with both 5V and 3.3V logic voltage. The RX pin from the HC-05 module does NOT tolerate the 5V logic voltage. Use a level converter or voltage divider with 1k and 2k resistors. Higher value resistors will prevent fast data transmission.

* in the example above, a voltage divider consisting of 2 resistors is used to protect the RX pin

The module operates in two modes:

Data mode: can receive and send data between Bluetooth devices

AT Command mode: in this mode you can change the module settings such as Baud Rate, Name, Password, etc...

Specifications:

Supply voltage: 3.6 - 6V

RX pin logic voltage: 3.3VDC

Operating consumption: 30mA

Communication: USART serial and TTL compatible

IEEE 802.15.1

FHSS

Bluetooth name: HC-05

Default password: 1234 or 0000

Default mode: Data Mode

Baud Rate Data Mode: 9600, 8, N, 1

Baud Rate Command Mode: 38400, 8, N, 1

Default firmware: LINVOR

Baud rate supported: 9600, 19200, 38400, 57600, 115200, 230400, 460800

Pins:

Enable/Key: Used to switch between Command Mode and Data Mode

VCC: 5V power supply

GND: Ground

TX: Pin that transmits serial data. It is connected to the RX pin of the Microcontroller

RX: Pin that receives serial data. It is connected to the TX pin of the Microcontroller

State: Pin connected to the integrated LED for displaying the status of the module

Using Pin Key:

Together with Arduino, the module can be connected to other digital pins by using SoftwareSerial . In the case of connecting the module directly to the RX and TX pins of the development board, before being able to upload a code to the board, these pins will have to be disconnected, otherwise the Arduino IDE will return an error in the upload.

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