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Ratings | 54 Answered Questions
SKU: 140303001334
Brand: Made in China
Warranty: 3 Days
৳ 370.04
Category: Bluetooth
Additional Information
The HC-05 Bluetooth Module is a high-performance Bluetooth-to-Serial Bridge designed for seamless wireless communication between microcontrollers, smartphones, and PCs. Functioning as a Class 2 transceiver, it provides a reliable "transparent" serial link with a range of approximately 10 meters, effectively replacing traditional wired asynchronous interfaces. This versatile module supports both master and slave configurations on the 2.4GHz ISM band, featuring PIO control and an integrated antenna for stable data transmission without the need to manage complex Bluetooth protocols or stacks.
Optimized for home automation, robotics, and embedded systems, the HC-05 allows you to pipe serial data wirelessly in a compact, lightweight 5g package. Measuring just 16.5mm x 43mm x 7mm, its edge-connector design ensures easy integration into space-constrained projects. Whether you are building remote-controlled robots or wireless sensor networks, the HC-05 offers a professional-grade, high-speed solution for bidirectional wireless connectivity..
| Parameter | Value |
|---|---|
| Model | Master-slave integrated Bluetooth module |
| Type | Power Module |
| Power | HC-05 |
| Frequency | 2.4GHz ISM Band |
| Weight | 5gm |
| Product Size | 16.5mm x 43mm x 7mm |
The HC-05 module utilizes two distinct communication modes via its serial interface to distinguish between system commands and wireless communication.
In AT Mode, you can fully customize the module's internal settings, including its name, baud rate, and security PIN code.
In Data Mode, the HC-05 functions as a transparent gateway, automatically handling Bluetooth packet construction and deconstruction. This allows data written to the UART port to be transmitted wirelessly, and received Bluetooth data to be sent directly to your microcontroller, eliminating the need to manage complex protocols.
The HC-05 module offers versatile connectivity through two primary roles: Master and Slave.
In the Slave Role (default), the module remains discoverable and waits for external devices, such as smartphones, to initiate a connection—making it ideal for mobile-controlled projects.
Conversely, in the Master Role, the HC-05 actively scans for and initiates connections with other Bluetooth modules, enabling direct wireless communication between two microcontrollers. Switching between these roles is easily managed by entering AT Mode and sending configuration commands via the UART port.
The HC-05 module features an onboard linear regulator, allowing it to be powered by a voltage range of 3.6V to 6V, despite the core chip operating at 3.3V.
However, it is critical to remember that the module utilizes 3.3V logic levels. Because the RX pin is not 5V-tolerant, connecting it directly to a 5V microcontroller (like an Arduino UNO) can cause damage.
To ensure safe operation, the microcontroller's TX signal must be stepped down to 3.3V using a voltage divider or level shifter. Additionally, current consumption varies based on the operational state, ranging from small idling currents to higher peaks during active transmission.
AT Mode is the dedicated configuration environment used to modify the HC-05 module's internal settings, such as its name, baud rate, and password. To enter this mode, you must press and hold the onboard button while powering up the module; a slow, steady LED blink confirms the transition.
Once active, the module accepts Hayes AT-style commands (e.g., AT+NAME=MyHC05) via the UART port. It is important to note that AT Mode typically operates at a default baud rate of 38400 bps, which may differ from your standard data transmission speed. This mode allows for full customization and status queries before returning to standard data communication.
The HC-05 module breaks out six pins for power, data, and control. Below is the detailed functional breakdown:
| Pin Name | Description |
|---|---|
| STATE | Status indicator; output is LOW when unpaired and HIGH when connected. |
| RXD | Receives serial data; not 5V-tolerant (requires step-down to 3.3V for 5V systems). |
| TXD | Transmits serial data to the microcontroller's RX pin. |
| GND | Common ground for both power and signal. |
| VCC | Power input (3.6V to 6V) for the onboard 3.3V regulator. |
| EN | Enable pin; pulled HIGH by default. Pulling it LOW disables the module. |
Complete the hardware connections as shown in the diagram, then upload the code from this Arduino Code to start communicating wirelessly.
Controlling the HC-05 is straightforward as it acts as a "data pipeline," wirelessly transmitting any serial data received via its RXD pin and outputting incoming Bluetooth data through its TXD pin. To set this up, you simply need to connect the module to a microcontroller's UART interface and pair it with a Bluetooth-enabled device (like an Android phone using the Serial Bluetooth Terminal app).
For Arduino users, it is recommended to use SoftwareSerial on digital pins (e.g., D2 and D3) to avoid interference with sketch uploads on the main hardware serial pins. While the VCC connects to 5V and GND to ground, you must use a voltage divider (a 1kΩ and 2kΩ resistor) to step down the Arduino’s 5V TX signal to 3.3V before it reaches the HC-05's RXD pin to prevent hardware damage.
The HC-05 Bluetooth Module is a compact, versatile wireless solution, supporting both master and slave modes with stable 2.4GHz connectivity. It integrates UART communication and GPIO control, making it ideal for robotics, automation, and remote-control applications.
TechShopBD offers up to one year of warranty and replacement support for its products, depending on the supplier(s) and product(s). The specific warranty duration for each product can be found on the respective product page. To be eligible for warranty and replacement support, customers must agree to our terms and conditions.
Note: This item is non-returnable. If this item arrives damaged or is not functioning properly, please don’t hesitate to contact us to determine if further action is required.
Our engineers are available to assist you. If you have any queries, please leave a comment below or call 09678110110 from 09:00 am to 06:00 pm (7 days a week). You can also reach us via WhatsApp or Facebook Inbox.
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Can this work with arduino uno r3?
By iftekhar.zafar@gmail.com on 03 Jan 2023
can i use it to control bluetooth rc car?
By fmercury209@gmail.com on 12 Aug 2022
Yes, you can.
By TechShopBD on 03 Sep 2022
Do you have the HC-05 which has the AT version 2016 or earlier. I am using the modules which are AT version 2019 which I brought from you earlier. But they have bigger delay than 2016. So, I need specifically 2016 or earlier. Please confirm if you have them in stock soon
By Nahian_Alindo on 17 Jan 2021
আমাদের নিকট VERSION:4.0-20190815 আছে। পূর্বের কোন ভার্শন আমাদের স্টকে নেই। আপনাকে এটিই পাঠানো হয়েছে। পরবর্তী প্রোডাক্ট না আসা অবদি ভার্শনের ব্যপারে কিছুই বলা যাচ্ছে না।
By TechShopBD on 17 Jan 2021
Thanks for sharing this information, you can visit my website to <a href="https://pricemama.com.bd/computers/">Computers & accessories </a>
By Minaakter01 on 03 Feb 2020
aita kobe available hobe??
By naeemturjo on 15 Jan 2019
Hopefully next week. If you have any urgency like project submission, we do not recommend you to wait for our stock.
By TechShopBD on 16 Jan 2019
Tahole kotha theke wait na kore kinte parbo?
By TechShopBD on 19 Apr 2019
Tahole kotha theke wait na kore kinte parbo?
By TechShopBD on 19 Apr 2019
Tahole kotha theke wait na kore kinte parbo?
By TechShopBD on 19 Apr 2019
Tahole kotha theke wait na kore kinte parbo?
By TechShopBD on 19 Apr 2019
Tahole kotha theke wait na kore kinte parbo?
By TechShopBD on 19 Apr 2019
আমাদের এই মাসের শেষদিকে আসার কথা। আপনার আরও আগে দরকার থাকলে অন্যান্য অনলাইন শপে দেখতে পারেন।
By TechShopBD on 21 Apr 2019
৳ 370.04
The latest and best price of Bluetooth Module HC05 Master Slave Support in BD is BDT 370.04 Taka. You can purchase the Bluetooth Module HC05 Master Slave Support at the best price on TechShopBD.com or visit our office to pick yours up today.
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