Bluetooth (HC-05) | Code | Circuit | Pin configuration

Bluetooth: HC-05  

Bluetooth module performs full-duplex wireless communication over the range of <100meters. The module can be used as a Master/ Slave mode by default it acts as a Slave mode. So you can easily interface this HC-05 Bluetooth Module with any of the microcontrollers using Serial port like Arduino, STM-32, PIC Microcontroller, ARM Processor, etc, which allows the Microcontroller to communicate with the other devices within the Bluetooth coverage area, and by using this HC-05 Bluetooth module you can implement firmware design applications. 

Model number: HC-05

Other related Devices: HC-06, HM-10 BLE

Other names: Bluetooth module, Bluetooth modem.

BLUETOOTH(HC-05)

HC-05 is a Bluetooth module, It is basically designed to use for firmware design in 

BLUETOOTH(HC-05)

Example:

• Wireless Data monitor and controlling using HC-05 from Computer/Mobile
• Wireless Led control from Android Mobile
• Wireless Home Automation using HC-05

 
NOTE:

If you want to control the devices over the 

Bluetooth range from Computer you need to install 

driver software.

Ex: Putty, flash magic, etc…
 
If you want to communicate with android mobile, you need an android app to install , nowadays so many Bluetooth-based apps are available in the play store.

Ex: Bluetooth spp manager.

 

DATASHEET CLICK HERE

Pin Description

Pin Number	Pin Name	Description
1	Enable / Key	This pin is used to toggle between Data Mode and command mode Data mode: set  to low  command mode: set to  high  By default, it is in Data mode
2	Vcc	Powers the module. Connect to the positive pin of  Supply voltage ex:=+5v pin
3	Ground	Ground pin of the module, connect to system ground. (Battery negative Terminal)
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 the onboard LED, it can be used as feedback to check whether the Bluetooth is connected or not.
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 toggle between Data and  command Mode

Technical  Specifications:

• Supply voltage: 3.3V to 6.0V
• Operating range: max. 10m (33 ft)
• Operating voltages: 3.3V (all other pins, except VCC)
• Working current: 30mA
• Length: 28 mm (1 in)
• Width: 15 mm (⅔ in)
• Height: 2.35 mm (0.1 in)
• Default password: 0000 or 1234 (depends on model/manufacturer)
• Supported baud rate: 9600,19200,38400,57600,115200,230400,460800
• Follows IEEE 802.15.1

How to Work with the HC-05 Bluetooth Module?

HC-05 can operate in two modes

Data mode- you can transfer and receive the data over Bluetooth range 

command mode – you want to change any default settings of the HC-05 then you can use the command mode and it also called as an AT command mode, why because you are using our list of AT-commands. 

    So if you want to work with HC-05 you need to connect with 

computer and install driver software (Putty, Flash magic)

 
  How to connect HC-05 with computer

1.      1.      Connect the HC-05 module with the computer by using USB-TTL converter and  also you have to install Driver software for USB-TTL converter. Are works like a bridge between the computer and Bluetooth module

.      After that u need to send data from the computer for that purpose you have to install flash magic/ Putty, here in my case I’m using Flash-magic Tool.

So up to now, we install FLASH MAGIC  and USB-TTL(CP210X) driver software.

USB-TTL(CP210X) interface with Bluetooth   

Download driver software CP210X    Download Flash Magic

BLUETOOTH(HC-05)-Interfacing with Computer

 

 

BLUETOOTH(HC-05)-Interfacing with Computer

USB -TTL(CP210X) Converter

 

Use full AT Commands :

AT+NAME:  Name of the module(HC-05)

AT+ADDR:  Address of the module

AT+VERSION: version

AT+UART: Baudrate (speed of data transmission)

AT+ROLE: See the role of Bluetooth module(1=master/0=slave)

AT+RESET: Reset and exit AT mode

AT+ORGL: Restore  Default settings

AT+PSWD: see default password (0000/1234)

FlashMagic

 

FlashMagic

FLASH MAGIC-TOOL

CLICK HERE for more AT commands

    

Bluetooth interface with Arduino

Bluetooth pin VCC – Arduino 5v

Bluetooth pin GND– Arduino (GND)

Bluetooth pin TX– Arduino (8)

Bluetooth pin RX– Arduino (9)

Arduino Code with Bluetooth Module-HC05:

/***************************************************** # Bluetooth module Example sketch follow us: www.technoelectronics44.com ******************************************************/ #include<SoftwareSerial.h> SoftwareSerial bluetooth(8,9); rx,tx char ch; void setup() { Serial.begin(9600); bluetooth.begin(9600); } void loop() { if(bluetooth.available()) { delay(10); char c = bluetooth.read(); } if(c > 0) { Serial.println(c); c=' '; } }

DATASHEET

 Applications

• Communication between microcontrollers
• Mobiles(using apps) communicate with Microcontrollers
• Bluetooth based Home automation system
• Wireless Robot control using Bluetooth and Mobile
  

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