2009 370Z IPOD -> A2DP Bluetooth Unit

radensb

Its been a while since I updated this, but I have made enough progress in my free time to complete a prototype that I currently use during daily driving. I have put together some snapshots to illustrate.



The system operates as follows:

1. Power up. Fetch stored Bluetooth address of previously attached device. If there is no previously attached device, enter discovery mode and wait for a connection.
2. Once connected, open an A2DP audio and AVRCP control link to the device, then send the Play command to start the media player and receive the current song metadata (track name, artist, album, length).
3. Send the Next Track command to start a new track and capture its metadata.
4. Construct the appropriate iPod formatted metadata response commands.
5. Begin responding the the Z iPod interface connection requests via the 30 pin connection, including the metadata response commands when needed.

Once the initialization is complete, the system will unlock the iPod interface control on the screen and allow the audio to pass through to the stereo. Media control is passed to the connected BT device via the iPod interface. The iPod commands are decoded and translated into BT multimedia commands. The resulting metadata is translated back into iPod command format and sent when requested to update the onscreen display in the car. To control the remote BT player:

1. Use the stereo controls in the dash or on the touch screen to play pause, or change tracks.
2. Use the steering wheel controls to send play, pause, next, or previous track commands.

I currently use the prototype to play static and streaming audio in my car via Bluetooth. The display currently shows me:

1. Track name
2. Artist
3. Album
4. Elapsed time
5. Number of track changes

So far, I have not had any problems with it operating with the other systems. When I get a phone call, It automatically sends the pause command witch causes my phone to pause the current track and answer the phone, then resumes play once the call is hung up just as you would expect it to do with an actual iPod connected.

I am currently adding a feature that will allow the audio to be transferred via a cable from the phone headphone jack to the iPod interface instead of the BT interface if desired to overcome the limitations of 16 bit BT audio quality. Personally, I think the quality is just fine, but others may be more picky. (I consider myself to be picky!) The idea is that with this configuration, only the AVRCP control link will be established if there is an audio cable detected. That way, the user gets the direct audio feed but can still control it via the car's various interfaces via the BT.

Dras

I am an iPhone user and have a 2009 370Z touring with factiry nav/bose. What is my best bet for bluetooth music streaming? I have the 30 pin cable from nissan and I saw a bunch of bluetooth adapters on Amazon but none of them say they are compatible with my car. I do not care about the ipod controls on the console, OK with controlling the music prom the phone display. Can anyone help with specific info on what I need to get to make it work? Thanks

Fountainhead

Hi Dras,

This is what I've used for the past 5 years.
https://www.amazon.com/Bovee-Wireles...words=tune2air

It was once called Viseeo Tune2Air but I guess they changed the name. Mine is called WMA1000 I think.
I use the iPod cable in my 2009 Touring to connect to it, but found that the problem is the Z radio first detects the iPod device then connects to it. Well synching the iPhone to the Viseeo device conflicts with the power up of the device from the radio and it randomly connects.
My solution is to get a 12V to 5V iPod charge adapter and plug it in between the Viseeo device and the car 30 pin. Then, as soon as the Accy line goes high the BT adapter is powered on and then the iPhone can find it.
Works VERY well for me for 5 years and I can still BT to the radio and receive and send calls no issues.

PS: I removed the iPod cable connector from the console tray and just put it inside the console to make it seamless and unobtrusive, and to be able to still use the mini tray in the center console (armrest, shifter cover, etc.).
NOTE: You'll have to tap into the Accy line inside/under the console. You'll need to take out the console (shifter portion, NOT the radio portion). Then after you tap into the Acccy line, just tuck everything under the center console and close! I can get at mine thru the cup holder if I need to.

Also I can control the iPhone from the radio over BT as if it were hard connected to the radio cable.
Good Luck!

Dras

Thank you Fountainhead!!! Appreciated.
-Dras

acmethod

This is great info. Thanks for sharing. Which 12-5v adapter did you use? The one I have doesn't seem to be doing the trick. The wma1000 randomly connects. It doesn't seem to get powered consistently.

Thanks for any info.