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Bluetooth Serial Transceiver HC-05

Bluetooth Serial Transceiver HC-05

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    • Product Code: BT-HC-05-MOD
    • Warranty Period: 12 months

    This is the popular Bluetooth module, HC05 which can be configured as master or slave.

    • Master Bluetooth will be able to search for other Bluetooth devices and initiate a connection.
    • Slave Bluetooth cannot search for other Bluetooth devices and can wait for the master to initiate a connection and accept the connection.

    It's very easy to add wireless serial connectivity for your device with this module because it comes with a UART interface. Examples of projects for Arduino and other boards are widely available. Once it is paired with another Bluetooth device it works like normal UART to exchange data. We called this transparent mode.

    This module has a built-in 3.3V voltage regulator and helps to break out the important pins (STATE, RXD, TXD, GND, VCC, and EN). Based on CSR BC4 chip, Bluetooth V2.0 + EDR. It is default loaded with SPP (Serial Port Profile) which becomes UART when it is connected via Bluetooth link. And there is a push button on HC-05 to set it into AT mode. Do check the video on how to use the button.



    • Bases at CSR BC04 Bluetooth technology.
    • With build-in 2.4GHz PCB antenna
    • It’s at the Bluetooth class 2 power level.
    • Range test: 10 meters
    • Operating voltage: 3.3V to 6V DC
    • Operating current in pairing is in the range of 30~40mA.
    • Operating current in communication is 8mA.
    • Interface via UART:
      • Default baudrate in Normal mode: 9600 bps
      • Default baudrate in AT Command mode: 38400 bps
    • Operating temperature range: -25 °C - +75°C
    • Dimensions 27mm×13mm×2.2mm

    Packing List:

    • 1 x HC05 Bluetooth module


    Which version is this?

    Module : HC-05

    Firmware : VERSION:4.0-20190728


    Firmware : VERSION:2.0-20100601

    Thank you
    ( Danial Zaidi, 16/07/2021 )
    Hi, you may drop an email to support@cytron.io for further technical assistance. Thanks:)
    Hi. The back of the transceiver marks TXD and RXD as 3.3V. It is my understanding that Arduino output pin voltage is 5V. Wouldn't this cause a problem? The tutorials do not mention using any resistors here, and directly connecting the transceiver to the Arduino. Thanks!
    ( Will, 20/01/2021 )

    Hi. This bluetooth HC-05 has operating voltage between 3.3V to 6V. So, it should be fine using arduino uno with this. Thansk:)

    Hi,is there any tutorial for this thing that using the blynk app.if yes,can you give the link. ( Zubair , 09/01/2021 )
    Hi, yes you may refer to this link. Thanks :)
    What is the different between hc-05 and hc-06 ( Mohammed Zubair Ali bin Mohd Akhir , 31/12/2020 )

    Hi. The difference is that HC05 has master code. Thanks:)

    Hi, yes we do have a few tutorials. Here's the link. Thanks :)
    Hi, what is the pinout for the Bluetooth HC-05? I can't find the pinout for HC-05 from the datasheet. ( Zharif, 05/11/2020 )
    Hi, you may refer to this link. Thanks :)
    Can I use the HC-05 with micro:bit? Is there any sample codes? Please advise. Thank you . ( Stephen Wong, 28/10/2020 )
    Hi. You can't use this with microbit as microbit only support 3V while HC-05 support 3.3V and above. Microbit itself have blueetoth in it. Thanks :)
    Im a beginner in bluetooth tech. Can it use as plug and play? Just connect to stereo system, an boom, done. Or i need to activate this and that? ( Beginner, 08/02/2020 )
    Hi, we're sorry as some simple coding is required. Thanks :)
    Hi. I tried to connect this module to another one while making it a Master. But, when i give command of AT+LINK=, there is nothing shown. It goes same to command AT+INIT and AT+IQR. When I search online, they said that we need to change to HC-05 2.0. May I ask what is the problem there? Or, can I change this module with firmware 2.0 if you still have it in your stock? ( NZ, 19/05/2019 )
    Hi, please email to support@cytron.io for more details.
    those this Bluetooth is needed in a QR code project? ( OTHMAN IRFAN, 07/04/2019 )
    Hi, for that project it depends on your project requirement. 

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    • 4.9 out of 5
    Total Reviews (240)
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    Tags: Bluetooth Module, HC-05, Bluetooth