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HC-05 Bluetooth Module

HC-05 Bluetooth Module

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  • Versatile Functionality: Buy the HC-05 Bluetooth Module for seamless wireless communication in various applications like GPS navigation systems, water meter readings, and electricity gas meter readings.
  • Dual Mode Configuration: This Bluetooth module allows you to easily switch between Master and Slave modes using AT Commands, with the default configuration set to Slave Mode.
  • Multi-Device Compatibility: Connect effortlessly with a wide range of devices such as phones, laptops, and microcontrollers for a competitive price.
  • USART Interface: The module uses USART for communication, making it compatible with microcontrollers supporting USART, and it's available at an affordable cost.
  • Command Mode Access: You can easily configure the HC-05 module's settings using the command mode, giving you control over your wireless connections.
  • Ideal for DIY Projects: Perfect for connecting computers, mobile phones, and microcontrollers for data exchange, and you can purchase it at a great price.
  • LED Feedback: The onboard LED provides status feedback for seamless operation, ensuring you get value for your money.
  • For bulk purchase you can check HC-05 Bluetooth Module-Pack of 20

HC-05 Bluetooth Module

Are you in search of an HC-05 Bluetooth Module, a versatile and cost-effective solution for your wireless communication needs? Look no further. This Bluetooth module offers seamless wireless communication for a wide range of applications, from GPS navigation systems to water and electricity meter readings.

Whether you're an electronics enthusiast, a DIY hobbyist, or a professional looking for competitive pricing, this module is designed to meet your requirements. The HC-05 Bluetooth Module lets you switch between Master and Slave modes with ease using AT Commands, and it comes pre-configured in Slave Mode.

Its compatibility with devices such as phones, laptops, and microcontrollers ensures hassle-free connectivity. With a USART interface, it's a perfect fit for microcontrollers supporting USART communication. Plus, you can configure its settings effortlessly using the command mode.

Ideal for DIY projects and data exchange, this Bluetooth module provides LED feedback for seamless operation, giving you the best bang for your buck. Buy the HC-05 Bluetooth Module today and enjoy top-notch wireless communication at a competitive price.

The HC-05 Bluetooth Module with Baseplate is a slave-only device.  This means that it can connect to most phones and computers with Bluetooth but it cannot connect to another slave-only device such as keyboards and other HC-06 modules. To connect with other slave devices a master module would be necessary such as the HC-05 module ,which can do both master and slave.

The slave mode in HC-05 Bluetooth cannot initiate a connection to another Bluetooth device but can accept connections. Master mode can initiate a connection to other devices.

Key Features:

  • Working current: matching for 30 mA, matching the communication for 8 mA.
  • With the computer and Bluetooth adapter, PDA, seamless connection equipment.
  • Use the CSR mainstream Bluetooth chip, Bluetooth V2.0 protocol standards.
  • Potter default rate of 9600, the user can be set up.
  • Bluetooth protocol: Bluetooth Specification v2.0+EDR
  • Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps.
  • Security: Authentication and encryption.
  • Profiles: Bluetooth serial port.

HC-05 Bluetooth Module Pin Diagram:

HC05 pin description

Bluetooth Module Pin Description

HC-05 Bluetooth Module Pin Description:

Pin Number

Pin Name



Enable / Key

This pin is used to switch between command mode (set low) and Data Mode (set high). The default setting of this HC 05 Bluetooth module is Data Mode.



This pin can be used to power the Bluetooth module. It has an operating voltage of +5V DC.



Connect the module's ground pin to the Microcontroller’s Ground Pin (GND).


TX – Transmitter

Sends serial data to the MCU. This pin will distribute all Bluetooth data in the form of serial data to the Microcontroller.


RX – Receiver

Obtain Serial Data. This pin will transmit all serial data that is provided to it over Bluetooth.



The on-board LED attached to the state pin can be used as feedback to see if Bluetooth is functioning properly.



Indicates the status of Module

  • Blink once in 2 sec: Command Mode
  • Repeated Blink: Waiting for connection in Data Mode
  • Blink twice in 1 sec: Connection successful in Data Mode



Used to control the Key/Enable pin to switch between Data Mode and command Mode

HC-05 Default Values:

  • Bluetooth Name: “HC-05”
  • Password: 1234 or 0000
  • Communication: Slave
  • Mode: Data Mode
  • Data Mode Baud Rate: 9600, 8, N, 1


  • Can be used for wireless communication between two microcontroller units.
  • Communicate with Laptop mobile phones etc.
  • Data Logging
  • Wireless Robots
  • DIY Home Automation Projects
  • GPS-based DIY projects.

DIY Home Automation using Arduino and Bluetooth HC05

    Package Includes:

    • 1 x HC-05 Bluetooth Module


    Serial communications 9600-115200bps
    Frequency 2.4~2.524 GHz
    Power Supply  5VDC
    Operating Current 30mA
    Range <100m
    Dimensions  30mm x 14mm x 2.2 mm
    Weight  5 grams

    Shipping & Returns

    • All orders confirmed before 3 pm IST are shipped on the
      same day, barring rare pickup delays on holidays or disturbances
    • Delivery time in Metro cities is 1-3 days, Others it is
      3-7 days. It varies based on location, reliant on courier services
    • Return window: 7 days from receipt unless stated
      otherwise. No refunds/replacements after
    • Returns only for non-working/damaged products are accepted
    • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
    • Refunds are processed within 3-4 working days post inspection and approval.

    For more details, please check our Shipping and Return Policy

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    1. What is the Bluetooth module HC-05? 

    • The HC-05 Bluetooth Module is a simple Bluetooth SPP (Serial Port Protocol) module that allows for the setup of a transparent wireless serial connection. Its communication is via serial communication which makes an easy way to interface with the controller or PC.

    2. How do I connect the HC-05 Bluetooth module to Arduino? 

    • To connect a HC-05 to Arduino:

    ● Connect VCC of HC05 with 3.3V of Arduino, please do not connect it with 5V as that can cook the module 

    ● Connect GND with any GND of Arduino 

    ● Connect Rx pin with Tx of Arduino 

    ● Connect Tx pin with Rx of Arduino 

    3. Why is the Bluetooth module used? 

    • The Bluetooth technology manages the communication channel of the wireless part. The Bluetooth modules can wirelessly transmit and receive data between two devices. With the help of the host controller interface (HCI), the Bluetooth module can receive and transmit data from a host system. 

    4. How do I know if my HC-05 is working? 

    • The first thing to do is to power on the Bluetooth module and see if you can connect to it. For this, you need an Android device. With the Bluetooth module powered and the LED(s) blinking, on the Android device go to Settings - Connections - Bluetooth and scan for Bluetooth devices.

    5.Why is HC-05 Bluetooth used?

    • When it comes to electronics and communication, wireless connectivity is quickly displacing traditional connections. A replacement for cable connectors The electronics are communicated with by HC-05 Bluetooth using serial communication. Typically, a short-range wireless connection is used to exchange files between small devices like mobile phones. It is utilized in numerous consumer applications, including wireless keyboards, wireless mouse, wireless headsets, and game controllers. It operates in the 2.45GHz range. Data can be transferred at a rate of up to 1Mbps over a distance of ten meters. 
    • The operating range of the HC-05 Bluetooth module is 4-6V of power supply. Baud rates of 9600, 19200, 38400, 57600, etc. are supported. The most important feature is that it can be used in Master-Slave mode, which prevents data from being sent to or received from outside sources.

    6.How many types of Bluetooth modules are there?