Bluetooth DIY Module

Trying to figure out how your going to Process the Audio Info And inject it into the Phone audio.

You can use a delay Line on the Blue tooth and Inject the Audio Information at the End?  Just Prior to Transmission?

That would bring things into a More Real Time and Less Delay?

I'm talking out my Azz here because I have no Idea how blue tooth works .

Assuming it a Digital Scheme how could you impose the Audio over it?

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What I need is a wireless feed of the detector output beep which isn't dependent on Bluetooth. This thing works just perfectly so I don't really need any advice on linking it all together. It's just that the entire Bluetooth signal is delayed by around 300ms making your beep delayed to around 5.8cm off of target. By itself, this wouldn't necessarily be bad because you could compensate. The problem arises when you don't know which direction the coil is swinging when you get the beep. If left, you will be 5.8cm off to the right. If the opposite, to the left. You see what we're up against?

So, the been needs to be independent of the Bluetooth device and be transmitted with no delay. That means an additional source of analog channel for the signal. This makes things complicated, as they say.

But, I'm on it. Just don't have enough time in a day to spend on personal projects. Being self employed means you have the worst boss in the universe.

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		Quote:			Posted by xavier
	OK I think I got it now, the signal from the detector is sent via Bluetooth to the head set and if the phone rings it turns off the signal from the detector and connects you to the phone? If this is correct then why not have the signal from the detector be sent to the head set via normal TX signal then if the phone rings the Bluetooth turns off the TX and connects you to the phone? The disadvantage that I can see is that if someone else is close to you with the same detector he will hear your signal unless his detector's TX signal is set to a different frequency. Or am I talking utter nonsense now?

Your first part is correct but the protocols on Bluetooth do not allow for analog signals at all. In order to take the signal directly from the detector to the headset requires another analog channel. That's the issue I'm dealing with. Yes, the headset is silent except for the phone ringing and you answering, etc. If you don't want to use that feature at all, then you can buy wireless headsets for a few dollars on eBay. Combining the Bluetooth and the analog is a problem due mostly to proximity. Two RF circuts in a tiny space don't cooperate well. After my most recent testing, I may scrap the project entirely and come up with my own system that can handle both on one stream and still answer phones. More like today's modern headphone mike wired hands free kits but made wireless.

Onward!

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The Bluetooth requires a heartbeat going constantly. It sends a digital command and response one tenth of a second apart. Now that is one of the reasons the delay occurs. That and the digital conversion of any sounds. When you use your phone with a Bluetooth device, that kind of delay isn't even noticed but swinging a coil means your beep occurs a few centimeters from target center. In only one direction? Manageable. Since it occurs in 2 dimensions on an XY plane, it is very difficult to compensate for the delay effects. The detector coil would need an accelerometer to sense which way the coil was and how far. I'm sure you can envision the resultant compensation calculations needed and then the digitizing. It would make things worse, not better.

So, after yesterday's testing, I have deemed this one impractical and I will abandon the use fo Bluetooth for this application. I'm going to use my module for controlling lights, fans, heaters and things like that around my house. Yes, I am an avid tinkerer and will be until I die, mate.

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GD, good idea to move this topic from the South African topic  that pea (Xavier) there will cause anything to get lost 

Now to get serious  I understand all that you have said with the delay in Bluetooth, but how do they get it right with the Xp Deus detector, as the signal from the coil is also Bluetooth and not cable, and the control panel is Bluetooth, and the headphones.... that is a lot of Bluetooth signals being processed and has to be exactly processed when going over the target and sent to each unit of the detector at the exact time without the delay.... there has to be a way seeing as they do it  just a thought.... Umm maybe you can get a Deus diagram or something 

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