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Bluetooth modules

Discussion in 'Electronic Design' started by Spehro Pefhany, Jan 28, 2004.

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  1. Have a LOW-volume mobile data acquisition application that requires
    Bluetooth. Not sure yet whether it will be Class I or II. Any
    suggestions as to good, reliable OEM modules? Unit cost is not a big
    factor. What's the situation with FCC/Industry Canada? I presume that
    type approval is required?

    Best regards,
    Spehro Pefhany
  2. Hi Spehro,

    Take a look at these: , especially the bare module.
    You can download datasheets from their ftp site:
    ftp://tdkuser:[email protected]/

    The modules are certified as an end product and therefore do not need any
    extra approvals. Just plug them into your application and you're ready. The
    modules can be programmed by modem style AT commands and can be setup as a
    'serial-wire' replacement. You make the right settings with a few AT
    commands and then two paired modules operate autonomously as a fully
    transparent serial channel. In Europe, they sell for about 85 euro/unit,
    which compares to appr. $100.

    I have used them to put BT functionality into a data multiplexer, so any
    Bluetooth device (PDA, PC or what have you) using the serial profile could
    talk to the multiplexer.

  3. Yes, that's just the sort of thing I'm looking for. Thanks for the
    suggestion, Meindert. They are made by TDK, I presume.

    Best regards,
    Spehro Pefhany
  4. Ben Jackson

    Ben Jackson Guest

    You can get SDIO cards that do bluetooth. That's a device in the
    SD/MMC form factor. I'm not sure what's involved in driving one.
  5. Yes. And they contain (as many others) a radio chipset from Cambridge
    Silicon Radio.
    Also the support for these modules is very good. You can mail directly with
    one of the software developers of the module and he is very responsive. But
    he is in the UK so mind the time difference.

  6. Bradley

    Bradley Guest

    You may also want to check out Wilcoxon Research (
    They have an industrial Bluetooth module with a 100m range. I have a
    couple sitting on my desk, but have not had the time to test them,
    yet. Their engineers were very helpful as well.

  7. Since nobody else has pointed this out, I will. RF does not go through
    aluminum, so you will need to have an external antenna, or have sufficiently
    large enough cutouts in the box that the RF will "leak" out.

    Mike Anton
  8. Thanks. ;-) It's a plastic (polycarbonate) enclosure, but I could
    imagine someone making that mistake. Once.

    Best regards,
    Spehro Pefhany
  9. Ethan

    Ethan Guest

    Some plastics will absorb RF energy and will seriously attenuate your
    signal, so you still want to be carefull of what type of material you
    use for your box. I don't know about polycarbonate. I have heard the
    way to find out if a plastic will work well is to put it in a
    microwave oven with a glass of water, and see if the plastic gets hot.

    Both microwave ovens and Bluetooth are at 2.4GHz so the plastic will
    absorb energy from both in the same way.

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