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Bluetooth info needed

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Bluetooth info needed

Unread postAuthor: lndncr2 » Sat Dec 08, 2012 12:22 am

The talk about a bluetooth ignitor got me wondering. Is there be a way to build a inexpensive bluetooth receiver for a two way radio? Wanted to use a bluetooth headset with my two way radio. Would someone point me in the right direction. Web search just turn up off the shelf units.
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Unread postAuthor: POLAND_SPUD » Sat Dec 08, 2012 6:51 am

You'd have to look up the profile used by bluetooth headsets - it isn't just a virtual serial port
http://en.wikipedia.org/wiki/Bluetooth_ ... _.28HSP.29

plus you'd have to interface the module with the two way radio... I can't tell if yours has any ports that can be used for this

All in all you might as well get an off the shelf product rather than spend hours trying to build this. If you want to build it because you've got some spare time and it seems like fun then go for it. If you don't then you might be better off with an off the shelf solution
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Unread postAuthor: Technician1002 » Sat Dec 08, 2012 11:30 am

Bluetooth is a digital format much like WiFi. Most radios may have digital PLL tuning, but the audio is Analog. As such, it would require a microprocessor interface to do the A/D conversion and interface with a Bluetooth receiver module. I don't know of any modules that contain all the stuff needed to interface with the analog (Mic and Earphone) ports on a 2 way radio. Good luck. This project would be an advanced microcontroller project at the very least.

One possibility is to see if you can find a pair of Bluetooth headsets that support Intercom Profile (ICP). With that, you might be able to pair the headsets to each other for a short range walkie talkie.
http://en.wikipedia.org/wiki/Bluetooth_profile#Headset_Profile_.28HSP.29
This is often referred to as the walkie-talkie profile. It is another TCS (Telephone Control protocol Specification)[3] based profile, relying on SCO to carry the audio. It is proposed to allow voice calls between two Bluetooth capable handsets, over Bluetooth.
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Unread postAuthor: POLAND_SPUD » Sat Dec 08, 2012 11:53 am

I don't know of any modules that contain all the stuff needed to interface with the analog
tech, there exists modules that are used exactly for this >>>
http://www.senabluetooth.com/products/s ... u=overview

I am pretty sure there even exist two way radios with an inbuilt bluetooth module specifically for use with bluetooth headsets (just google bluetooth two way radio headset - you'll get lots of results )

I think he asked this question because he's looking for a cheaper alternative... from what I've seen these things cost over 100$.
The thing is that rolling your own will probably be more expensive than just buying a ready made product
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Unread postAuthor: Technician1002 » Sat Dec 08, 2012 4:45 pm

I guess I should have Googled for them. I've never seen one in a store. I guess as a specialty item instead of a consumer item, they are only for purchase online as a special order.
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Unread postAuthor: POLAND_SPUD » Sat Dec 08, 2012 8:12 pm

Guess what - I've done some research and I found this -> http://www.oemblue.com/Bluetooth%20Audi ... odule.html

and then this ->
Image


Well I always wondered what are the other connectors for on all of these modules... :roll:

so in other words it might be easier than we thought

EDIT
ohh tech and have a look at the datasheet too ->
https://www.bluetooth.org/tpg/RefNotes/ ... 1_V01D.pdf

It seems there are programmable IOs too - not sure if I understand that correctly but apparently one wouldn't even need a microcontroller to turn on/off a few relays
(I am reffering here to the thread on remote ignition modules)
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Unread postAuthor: lndncr2 » Sat Dec 08, 2012 11:00 pm

Thanks. Looks like I will be reading alot of info. Hoped for a prebuilt module that would interface a blue tooth headset to my radio with minor tweaking. Radio just has standard analog mic/speaker jacks. Wanted to use a manual push to talk setup.
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