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Discuss Hacking the Motorola D650 Bluetooth Dongle to work with the iPhone/iPod Touch at the Hardware - Hackint0sh.org; YAY! He answers our question at the 17 minute mark. "Jump pin 21 to the ...
  1. #11
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    YAY! He answers our question at the 17 minute mark.

    "Jump pin 21 to the 12v ground (pin 29 or 30) using either a 1k or a 1M resistor, and you WILL get audio out."

    Now I just tested with my nice little multimeter, and it shows open line between 21 and 29. No connection. Whatever I did earlier must have been a bad connection - so I guess I need to hit up radio shack for some known-good resistors on my way home from work today.
    Last edited by Numbski; 08-29-2008 at 02:28 PM.


  2. #12
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    OH CRAP!

    Minute 18 - he describes the odd numbered pins. Pin 1 - far LEFT!!! I've been counting pin 1, far RIGHT!. That's what the board says, and I believed it. Much cursing. MUCH, MUCH cursing. Crap. So everything I know is backwards???? UGH!

    Fixed:



    EDIT - that last spot is NOT Left Audio. It's audio ground, but with something like 1.5Mohms of resistance. ???
    Last edited by Numbski; 08-29-2008 at 03:48 PM.

  3. #13
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    Okay, so I got impatient and tried a 4.7k resistor I had laying around (these things tend not to be brain surgery - a range of values will work), and I still got alerted that the accessory was "not made for the iphone", but music kept playing out of the built-in speakers. What's notable is that the blue LED on the D650 never came on. I've done so much soldering with such a fat soldering iron that I need to make sure to clean up all of the pins. I need to leave for work now - REALLY. I'll mess with this a bit more over the weekend, but likely I've bridged some pins on the dock connector. Also, my little audio tester dealie is grounded to the wrong ground, so I need to re-do that audio probe and see if I'm getting audio out. If I am, but the speakers are still playing, at least that's a step in the right direction.

  4. #14
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    I'm not even home yet and I can tell that I've bridged connections someplace. Looking at the way things line up on the right, I can say with a pretty high level of confidence that I know what those "test" points aren't, and they aren't test points. They're hole-through connections for a minature usb jack (top) and a miniature firewire jack (bottom). D'oh. So turning this into a bluetooth dock just got simpler - it's a matter of ordering the right parts from digikey, and you'll have usb and firewire ports for docking (usb) and charging (both). Not too shabby.

    I'm still at work, but I'll pick up some 1k resistors on the way home. As far as I can tell, this mod boils down to soldering a 1k resistor from pin 21 to pin 29. That's it, job over (or so far as I can tell).

    If you want to get fancy, order a mini usb port and mini firewire port from digikey, push the connectors into the holes, solder, then dremel out holes in the case for the two connections. Presuming I'm right about pin 21 to 20 giving us audio-out (where the bluetooth chip can get to it), then the only other mod would be to put a surface-mount 1/8" mini jack in, and solder it to pins 2,3, and 4.

  5. #15
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    The database seems to be eating my responses this morning...

    Okay - it looks like I might have killed my D650 from excessive heat. Not suprising since I've been soldering it a LOT. I'll give it a shot again later today. In the meantime, I know for fact that the problem is the pin 21 to 29 connection. If I plug my iPhone into it's dock, it starts playing out pins 3 and 4 as it should. Plug in my D650 immediately aftwerwards, the audio is still playing out pins 3 and 4, my the phone immediately snips at me that this device is "incompatible". BS.

    So the next step is to get a PodBreakout connector, and remove the existing iPod connector from the board. The PodBreakout boards are backordered, so it may be a bit before I get it. I went ahead and ordered it anyway, so maybe I'll get lucky. Once I get the board, I'll remove the dock connector from my D650, and then connect 21 to 29 on the PodBreakout using a 1k resistor, and hook speakers to 2,3, and 4. Once I confirm I'm getting audio out, then I'll run 2,3, and 4 to the D640, along with USB power. What I expect to happen is that it starts working with the headphones, but I won't be able to do track forward, track back, and play. The final step would be to reconnect the serial pins. If it's working from there then I'll reconnect the rest of the pins one at a time until it stops working - then I'll figure out why that's happening.


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    The database seems to be eating my responses this morning...

    Okay - it looks like I might have killed my D650 from excessive heat. Not suprising since I've been soldering it a LOT. I'll give it a shot again later today. In the meantime, I know for fact that the problem is the pin 21 to 29 connection. If I plug my iPhone into it's dock, it starts playing out pins 3 and 4 as it should. Plug in my D650 immediately aftwerwards, the audio is still playing out pins 3 and 4, my the phone immediately snips at me that this device is "incompatible". BS.

    So the next step is to get a PodBreakout connector, and remove the existing iPod connector from the board. The PodBreakout boards are backordered, so it may be a bit before I get it. I went ahead and ordered it anyway, so maybe I'll get lucky. Once I get the board, I'll remove the dock connector from my D650, and then connect 21 to 29 on the PodBreakout using a 1k resistor, and hook speakers to 2,3, and 4. Once I confirm I'm getting audio out, then I'll run 2,3, and 4 to the D640, along with USB power. What I expect to happen is that it starts working with the headphones, but I won't be able to do track forward, track back, and play. The final step would be to reconnect the serial pins. If it's working from there then I'll reconnect the rest of the pins one at a time until it stops working - then I'll figure out why that's happening.

  7. #17
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    Numbski....

    I soldered a 1K res to 29 and 21. I'm still not getting audio out on the adapter. I get sound through the speakers on my 3G iphone. I can change tracks and pause and play but no sound.

    Any updates on your front?

  8. #18
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    Only that I'm waiting for the PodBreakout adapter to be shipped so I can remove the connector from the board and hook things up one at a time.

    It seems to me that there is already something on the serial pins throwing this whole thing off. If you're really brave and have a steady hand, maybe take some desoldering braid to the serial pins, and gently lift those pins up just a tad, maybe slip a piece of paper between the pin and the contact point, then see if you get any audio.

  9. #19
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    Okay, well I do have some status.

    I cut a usb cable in half, and soldered the wire to the top pin header on the board, and it does indeed charge the phone and sync. I cheated a little bit and soldered the black wire to one of the "arms" of the dock donnector, but they're connected on the board anyway. In case you want to replicate this, solder them from top to bottom:

    black
    green
    white
    red

    Works perfectly.

  10. #20
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    I think there still is a problem with the activate pin. When I first plugged it in it gave me the message about going into airplane mode. It only does this once and I have to wait a while to make it do it again. I'm guessing that were still not pulling that pin down with the correct resistance yet. I don't have a real dock to look at that works so maybe if we can get one that actually plugs in and outputs audio over it we can measure the resistance on that pin 21 to ground. I guess I can try a 1Mohm resistor to see if that makes a diff.


 

 
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