BLUETOOTH MODULE HC-05, V2.0+EDR

All pictures are for illustrative purposes only.

PID# 20202

15,00 CA$ EACH
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Description

Bluetooth serial modules allow all serial enabled devices to communicate with each other using Bluetooth.

It has 6 pins,

1.  Key/EN: It is used to bring Bluetooth module in AT commands mode. If Key/EN pin is set to high, then this module will work in command mode. Otherwise by default it is in data mode. The default baud rate of HC-05 in command mode is 38400bps and 9600 in data mode.

HC-05 module has two modes,

          1.  Data mode: Exchange of data between devices.

          2.  Command mode: It uses AT commands which are used to change setting of HC-05. To send these commands to module serial (USART) port is used.

2.  VCC: Connect 5 V or 3.3 V to this Pin.

3.  GND: Ground Pin of module.

4.  TXD: Transmit Serial data (wirelessly received data by Bluetooth module transmitted out serially on TXD pin)

5.  RXD: Receive data serially (received data will be transmitted wirelessly by Bluetooth module).

6.  State: It tells whether module is connected or not.

 

HC-05 module Information

  • HC-05 has red LED which indicates connection status, whether the Bluetooth is connected or not. Before connecting to HC-05 module this red LED blinks continuously in a periodic manner. When it gets connected to any other Bluetooth device, its blinking slows down to two seconds.
  • This module works on 3.3V. We can connect 5V supply voltage as well since the module has on board 5 to 3.3 V regulator.
  • As HC-05 Bluetooth module has 3.3V level for RX/TX and microcontroller can detect 3.3 V level, so, no need to shift transmit level of HC-05 module. But we need to shift the transmit voltage level from microcontroller to RX of HC-05 module.
  • The data transfer rate of HC-05 module can vary up to 1Mbps is in the range of 10 meters. 

 

Specification of HC-05 Bluetooth Module

  • Bluetooth version: 2.0 + EDR (Enhanced Data Rate)
  • Frequency: 2.4 GHz ISM band
  • Modulation: GFSK (Gaussian Frequency Shift Keying)
  • Transmit power: Class 2 (up to 4 dBm)
  • Sensitivity: -80 dBm typical
  • Range: approximately 10 meters (or 33 feet) in open air
  • Profiles supported: SPP (Serial Port Profile), HID (Human Interface Device) and others
  • Operating voltage: 3.3V to 5V DC
  • Operating current: less than 50mA
  • Standby current: less than 2.5mA
  • Sleep current: less than 1mA
  • Interface: UART (Universal Asynchronous Receiver/Transmitter)
  • Baud rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, and 460800
  • Operating temperature: -20°C to 75°C (-4°F to 167°F)

 

Bluetooth communication between Devices

E.g. Send data from Smartphone terminal to HC-05 Bluetooth module and see this data on PC serial terminal and vice versa.

To communicate smartphone with HC-05 Bluetooth module, smartphone requires Bluetooth terminal application for transmitting and receiving data. You can find Bluetooth terminal applications for android and windows in respective app. store.

In this picture shows how Bluetooth Module Interfacing With Laptop
Bluetooth Module Serial Interface

 

So, when we want to communicate through smartphone with HC-05 Bluetooth module, connect this HC-05 module to the PC via serial to USB converter.

Before establishing communication between two Bluetooth devices, 1st we need to pair HC-05 module to smartphone for communication.

Pair HC-05 and smartphone:

  1. Search for new Bluetooth device from your phone. You will find Bluetooth device with “HC-05” name.
  2. Click on connect/pair device option; default pin for HC-05 is 1234 or 0000.

After pairing two Bluetooth devices, open terminal software (e.g. Teraterm, Realterm etc.) in PC, and select the port where we have connected USB to serial module. Also select default baud rate of 9600 bps.

In smart phone, open Bluetooth terminal application and connect to paired device HC-05.

It is simple to communicate, we just have to type in the Bluetooth terminal application of smartphone. Characters will get sent wirelessly to Bluetooth module HC-05. HC-05 will automatically transmit it serially to the PC, which will appear on terminal. Same way we can send data from PC to smartphone.

 

Command Mode

  • When we want to change settings of HC-05 Bluetooth module like change password for connection, baud rate, Bluetooth device’s name etc.
  • To do this, HC-05 has AT commands.
  • To use HC-05 Bluetooth module in AT command mode, connect “Key” pin to High (VCC).
  • Default Baud rate of HC-05 in command mode is 38400bps.
  • Following are some AT command generally used to change setting of Bluetooth module.
  • To send these commands, we have to connect HC-05 Bluetooth module to the PC via serial to USB converter and transmit these command through serial terminal of PC.
Command Description Response
AT Checking communication OK
AT+PSWD=XXXX

Set Password

e.g. AT+PSWD=4567

 OK
AT+NAME=XXXX

Set Bluetooth Device Name

e.g. AT+NAME=MyHC-05

 OK
AT+UART=Baud rate, stop bit, parity bit

Change Baud rate

e.g. AT+UART=9600,1,0

 OK
AT+VERSION? Respond version no. of Bluetooth module

+Version: XX OK

e.g. +Version: 2.0 20130107   OK
AT+ORGL Send detail of setting done by manufacturer Parameters: device type, module mode, serial parameter, passkey, etc.

 

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