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Inside the car dock.

Discussion in 'Droid 3 Hacks' started by ACalcutt, Jul 21, 2011.

  1. ACalcutt
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    ACalcutt New Member

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    I took apart the car dock yesterday to see if there was an easy way to make it pass data and keep the audio.

    I didn't get very far on this yet (not sure I will) , but here are some pictures of the internals for anyone that may be interested.


    EDIT: Does anyone know if this board is basically a mini usb soundcard?
  2. imnotmikal
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    imnotmikal New Member

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    What purpose would passing data serve, in a car dock?
  3. ACalcutt
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    ACalcutt New Member

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    The short answer is I would like to use pdanet usb tether instead of bluetooth tether to my laptop.

    The longer answer is I have a wireless mapping project (see vistumbler in my signature) that works with google earth. I like having a connection to the internet so google earth can pull in the imagery of my surroundings. Vistumbler maps access points live, somewhat like wardrive for android but with more information.


    I assume audio is being passed over the usb data wires, since mirco usb doesn't have its own connections for audio
    Last edited: Jul 21, 2011
  4. b00mb00mchuck
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    b00mb00mchuck New Member

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    My pioneer head unit has a usb port... it will charge the phone as well as read the memory as a flash drive and i'm able to play all the songs on my D1 using the head unit's player.... song info, artist, folder, etc are displayed on the dash display and the use of the remote control is what I don't want to lose... i'm driving, i'm comfortable, and now I have to lift my arm and lean forward to skip a track?.... that sucks .... I woulda just got one of those stupid generic clamp holders if I had known about this up front....
  5. wseyller
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    wseyller New Member

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    Hmm. I have a new Kenwood bluetooth car cd player with front USB port. Wonder if it will work with my D1. I may try it out later.

    Edit: It does works. Soon as I plug it in the cd player starts reading but I have to be quick to turn on usb storage on the phone before the cd player quits searching. It starts playing ringtone and notification sounds i have on the sd card first. I can skip to other songs and folders to get to my actual music.
    Last edited: Jul 25, 2011
  6. Joefishnc
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    Joefishnc New Member

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    Magnet

    How does the D3 know that it is in the Car Dock? Is there a magnet like on the Home Dock? if so where? or is it USB Controlled?
  7. phunk
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    phunk New Member

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    It's not a magnet, it detects the usb connection.
  8. ACalcutt
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    ACalcutt New Member

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    Well, I messed with making the car dock pass data again today. Here are the results





    First I removed the circuit board from inside the car-dock and spliced it to a USB Type A connector to the dock usb connection (the connection that connects to the phone).
    View attachment 39261
    View attachment 39262
    If all I wanted to do was pass data this would be enough, this worked to connect to my laptop, but most of the time I want to use the audio pass through adapter. My idea was to take the circuit inside the cardock and make an adapter out of it (which i could hide inside the dash or something).
    View attachment 39263
    View attachment 39264
    This somewhat works. When power is applied the phone goes car-dock mode. It does not pass audio however. I found for audio the brown wire was also needed (I think this is connected to pin 4 which is usually not connected in micro usb). The problem is because I used USB-A connectors (so it could easily be connected to the laptop) it doesn't have the extra wire i needed (doh)

    So...back to the drawing board I guess...so close


    I couldn't find my meter, but i think this is the pinout of the dock connection
    [TABLE="class: wikitable"]
    [TR]
    1 [TD]+5
    [/TD]
    [TD]Red[/TD]
    [TD][/TD]
    [/TR]
    [TR]
    2 [TD]Data−
    [/TD]
    [TD]White[/TD]
    [TD][/TD]
    [/TR]
    [TR]
    3 [TD]Data+
    [/TD]
    [TD]Green[/TD]
    [TD][/TD]
    [/TR]
    [TR]
    4 [TD][/TD]
    [TD]Brown
    [/TD]
    [TD]- Seems to be needed for audio
    [/TD]
    [/TR]
    [TR]
    5
    [TD]GND
    [/TD]
    [TD]Black[/TD]
    [TD][/TD]
    [/TR]
    [/TABLE]

    I think the yellow wire is just the outside sheilding/ground
    Last edited: Aug 18, 2011
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