Information about HC05 Bluetooth module

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Information about HC05 Bluetooth module

        


Pin Configuration

Pin Number
Pin Name
Description
1
Enable / Key
This pin is used to toggle between Data Mode (set low) and AT command mode (set high). By default it is in Data mode
2
Vcc
Powers the module. Connect to +5V Supply voltage
3
Ground
Ground pin of module, connect to system ground.
4
TX – Transmitter
Transmits Serial Data. Everything received via Bluetooth will be given out by this pin as serial data.
5
RX – Receiver
Receive Serial Data. Every serial data given to this pin will be broadcasted via Bluetooth
6
State
The state pin is connected to on board LED, it can be used as a feedback to check if Bluetooth is working properly.
7
LED
Indicates the status of Module
  • Blink once in 2 sec: Module has entered Command Mode
  • Repeated Blinking: Waiting for connection in Data Mode
  • Blink twice in 1 sec: Connection successful in Data Mode
8
Button
Used to control the Key/Enable pin to toggle between Data and command Mode
HC-05 Default Settings
  • Default Bluetooth Name: “HC-05”
  • Default Password: 1234 or 0000
  • Default Communication: Slave
  • Default Mode: Data Mode
  • Data Mode Baud Rate: 9600, 8, N, 1
  • Command Mode Baud Rate: 38400, 8, N, 1
  • Default firmware: LINVOR

HC-05 Technical Specifications

  • Serial Bluetooth module for Arduino and other microcontrollers
  • Operating Voltage: 4V to 6V (Typically +5V)
  • Operating Current: 30mA
  • Range: <100m
  • Works with Serial communication (USART) and TTL compatible
  • Follows IEEE 802.15.1 standardized protocol
  • Uses Frequency-Hopping Spread spectrum (FHSS)
  • Can operate in Master, Slave or Master/Slave mode
  • Can be easily interfaced with Laptop or Mobile phones with Bluetooth
  • Supported baud rate: 9600,19200,38400,57600,115200,230400,460800


HC-05 Equivalent Bluetooth Module
HC-02


Other Bluetooth Modules

HC-04, HC-06, HM-11, ESP32, CSR8645

Where to use HC-05 Bluetooth module

The HC-05 is a very cool module which can add two-way (full-duplex) wireless functionality to your projects. You can use this module to communicate between two microcontrollers like Arduino or communicate with any device with Bluetooth functionality like a Phone or Laptop. There are many android applications that are already available which makes this process a lot easier. The module communicates with the help of USART at 9600 baud rate hence it is easy to interface with any microcontroller that supports USART. We can also configure the default values of the module by using the command mode. So if you looking for a Wireless module that could transfer data from your computer or mobile phone to microcontroller or vice versa then this module might be the right choice for you. However do not expect this module to transfer multimedia like photos or songs; you might have to look into the CSR8645 module for that.

How to Use the HC-05 Bluetooth module

The HC-05 has two operating modes, one is the Data mode in which it can send and receive data from other Bluetooth devices and the other is the AT Command mode where the default device settings can be changed. We can operate the device in either of these two modes by using the key pin as explained in the pin description.
It is very easy to pair the HC-05 module with microcontrollers because it operates using the Serial Port Protocol (SPP). Simply power the module with +5V and connect the Rx pin of the module to the Tx of MCU and Tx pin of module to Rx of MCU as shown in the figure below
HC-05 Bluetooth Module Circuit Connections
During power up the key pin can be grounded to enter into Command mode, if left free it will by default enter into the data mode. As soon as the module is powered you should be able to discover the Bluetooth device as “HC-05” then connect with it using the default password 1234 and start communicating with it. The name password and other default parameters can be changed by entering into the

Applications

1. Wireless communication between two microcontrollers
2. Communicate with Laptop, Desktops and mobile phones
3. Data Logging application
4. Consumer applications
5. Wireless Robots
6. Home Automation

2D Model

HC-05 Bluetooth Module Dimensions


Circuit diagram to interface HC05 to Ardiuno





Code for HC05-Bluetooth module


// Include Libraries
#include "Arduino.h"
#include "BTHC05.h"


// Pin Definitions
#define BTHC05_PIN_TXD 11
#define BTHC05_PIN_RXD 10



// Global variables and defines

// object initialization
BTHC05 bthc05(BTHC05_PIN_RXD,BTHC05_PIN_TXD);


// define vars for testing menu
const int timeout = 10000;       //define timeout of 10 sec
char menuOption = 0;
long time0;

// Setup the essentials for your circuit to work. It runs first every time your circuit is powered with electricity.
void setup() 
{
    // Setup Serial which is useful for debugging
    // Use the Serial Monitor to view printed messages
    Serial.begin(9600);
    while (!Serial) ; // wait for serial port to connect. Needed for native USB
    Serial.println("start");
    
    bthc05.begin(9600);
    //This example uses HC-05 Bluetooth to communicate with an Android device.
    //Download bluetooth terminal from google play store, https://play.google.com/store/apps/details?id=Qwerty.BluetoothTerminal&hl=en
    //Pair and connect to 'HC-05', the default password for connection is '1234'.
    //You should see this message from your arduino on your android device
    bthc05.println("Bluetooth On....");
    menuOption = menu();
    
}

// Main logic of your circuit. It defines the interaction between the components you selected. After setup, it runs over and over again, in an eternal loop.
void loop() 
{
    
    
    if(menuOption == '1') {
    // HC - 05 Bluetooth Serial Module - Test Code
    String bthc05Str = "";
    //Receive String from bluetooth device
    if (bthc05.available())
    {
    //Read a complete line from bluetooth terminal
    bthc05Str = bthc05.readStringUntil('\n');
    // Print raw data to serial monitor
    Serial.print("BT Raw Data: ");
    Serial.println(bthc05Str);
    }
    //Send sensor data to Bluetooth device  
    bthc05.println("PUT YOUR SENSOR DATA HERE");
    }
    
    if (millis() - time0 > timeout)
    {
        menuOption = menu();
    }
    
}



// Menu function for selecting the components to be tested
// Follow serial monitor for instrcutions
char menu()
{

    Serial.println(F("\nWhich component would you like to test?"));
    Serial.println(F("(1) HC - 05 Bluetooth Serial Module"));
    Serial.println(F("(menu) send anything else or press on board reset button\n"));
    while (!Serial.available());

    // Read data from serial monitor if received
    while (Serial.available()) 
    {
        char c = Serial.read();
        if (isAlphaNumeric(c)) 
        {   
            
            if(c == '1') 
    Serial.println(F("Now Testing HC - 05 Bluetooth Serial Module"));
            else
            {
                Serial.println(F("illegal input!"));
                return 0;
            }
            time0 = millis();
            return c;
        }
    }
}



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