Bluetooth Transmitters.

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RobertPalmer

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#5070 26-Sep-2005 03:21

I would like to put a bluetooth transmitter inside a stand alone unit that will send a file to a mobile when the phone is within a 10 metre range.

How small could the transmitter be?
How could the file be stored within the unit?
Can this unit run off batteries?

Thankyou for any help that you can give me!

Robert.

3g

341 posts

Ultimate Geek

#20534 26-Sep-2005 10:30

Without knowing more details it's hard to tell what the best option would be, but off the top of my head I'd probably just use a phone running Java.

I know that there's a really good SDK for the Sony Ericsson Z1010 (available from the Sony Ericsson developers website). The Z1010 has a memory stick so you could stored the file on that.

If you've got more details/system constraints, please post them 8-).

RobertPalmer

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#20567 27-Sep-2005 00:58

More details....

The unit is a indendent device that needs to be no larger than 10cm x 5cm x 5cm.

I was intending the battery to last for 6 months.

I would like it to send a small jpeg and text file that could be stored persons phone when they walk past.

How would my device detect the users mobile, would this mean that it the independent device must be searching all the time?

Would I use SDK to write the file that the device sends or is this the software that is used to send bluetooth?

Thanks for your help 3g.

tonyhughes

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#20574 27-Sep-2005 07:47

RobertPalmer: More details....

The unit is a indendent device that needs to be no larger than 10cm x 5cm x 5cm.

I was intending the battery to last for 6 months.

These two specifications are mutually exclusive with current technology...

RobertPalmer

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#20576 27-Sep-2005 08:09

So there is no way that a remote device can transmit a file via bluetooth?

Am I just dreaming then.

tonyhughes

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#20577 27-Sep-2005 08:14

Sorry, what I meant is that a battery with those dimensions (less in fact because it shares the space with the device) is not going to last six months with a Bluetooth radio turned on.

(Perhaps 5 days....)

You could look at a Solar charger?

What are you actually trying to acheive - there are some smart cookies on this board who might think of another method to acheive your goal.

RobertPalmer

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#20579 27-Sep-2005 08:31

Hello smart cookies!

I am trying to design a device that is attatched toa post in a park that can send a jpeg with text to someone when they walk past, I gathered that bluetooth was the option I would use.

I saw a billboard that used bluecasting to send out an advert, this was wired into 240v mains! My problem is that I dont have any power source to tap off, except the sun! and batteries.

Does a bluetooth radio permenantly search for bluetooth devices? Does the radio have an internal harddrive that saves the deired information and sends it?

Any ideas would really help my project. Can you steer me towards anyone who can help

cheers disenchanted.

sbiddle

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#20598 27-Sep-2005 11:35

Arghh! I got sick of those units in London, I had 2 or 3 devices try and continually send files to my phone! There was a display board somewhere in one of the tube stations (oxford circus from memory) and a couple of others as well. Combine that with people sending porn to your phone and it's enough to switch your phone to invisible mode or turn bluetooth off!

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tonyhughes

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#20623 27-Sep-2005 17:16

RobertPalmer: Hello smart cookies! I am trying to design a device that is attatched toa post in a park that can send a jpeg with text to someone when they walk past, I gathered that bluetooth was the option I would use.

About the best option for this.

I saw a billboard that used bluecasting to send out an advert

What a pain in the butt. If this happened to me I would make all my devices invisible. Its like spam for mobiles...

, this was wired into 240v mains! My problem is that I dont have any power source to tap off, except the sun! and batteries.

SolarsolarSOLARsOlArSoLaR

tonyhughes

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#20640 27-Sep-2005 20:36

I think you may also find that without appropriate security, there will be plenty of people who think "Where did that come from" and do some testing to pinpoint the location of your device to vandalise it and/or steal it...

RobertPalmer

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#20651 27-Sep-2005 23:55

Its not for advertising its educational. I was going to place it a out of arms reach!

Im concerned about what sort of radio i would need to put inside it, I've found a few, they are at home at the moment. I'll post them up later.

the solar is a great idea!

thanks for your input.

sorry for the multi threads

RobertPalmer

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#20759 30-Sep-2005 00:20

Would this be the sort of tranciever I would use to send by file?

Where is the file stored?

RobertPalmer

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#20760 30-Sep-2005 00:20

............ http://www.rfmd.com/blueRM_products.asp