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Thread: aubtm-20 bluetooth module

  1. #1

    Default aubtm-20 bluetooth module


    this is vivek from mumbai.
    I am using aubtm-20 for my Final year Graduate degree in Electronics Engg.
    I am just not able to communicate(send AT commands) to aubtm from PC(hyperterminal winXP).
    hyperterminal settings: baud rate : 9600 bps, data bits :8, stop bits: 1, parity: none, flow control: none
    to enter command mode, i send LLL from hyperterminal within 60sec of powering ON aubtm-20.
    BUT i get no response at all.

    Please describe in detail the method i should use to send AT commands to aubtm-20 and receive responses.
    I would be grateful for your kind assistance. I have to complete my project in just a weeks time.
    Please Help. Awaiting your response.

    thank you,
    Vivek M

  2. #2

  3. #3
    Senior Member T-1000
    Join Date
    Jun 2007


    Most blue tooth modules i have used is based on 3.3 volt operation so MAX232 wont work! What is the VCC of MAX232 you can giving? If its 5v then buy a new bluetooth module

    Where you have bought the modules?

    You have to use a LM1117-3.3 volt IC to power up the module. Then use a zener 3.3 volt adaptor at i/o pins. Use a USB to TTL module like this

    You may have a look at my setup here

    Sorry admin for posting a link to my forum, as your upload policy is weired ! Increase the image update max size and resolution)
    Avinash Gupta

  4. #4


    i give 3.3v to bluetooth module (2 AA batteries) and 5v supply to max232 ic.

    is it the 3.3v supply dat i give to aubtm-20(bluetooth module) creating problems?
    i got this module from a distributor Rajguru Electronics, lamington rd, mumbai.

    i didnt get ur 3.3v to 5v zener adaptor. Could you please elaborate or give a schematic?

  5. #5


    is this the connection u meant?

  6. #6


    there is a 3.3v pin on this board.

    what is the purpose of this pin? is it a supply(VDD) pin?

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