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Nexus 7 in 2001 A4, fully loaded!

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  • Nexus 7 in 2001 A4, fully loaded!

    Hi all, just thought I would introduce myself. My name is Travis, and I've been working with a Nexus 7 (2012) in-dash since about October of 2012.
    I was one of the early people who worked with Timur to help him develop Timur's kernel and then USB ROM for the Nexus 7.

    To start from the beginning, I had a 1998 Audi A4 1.8TM. This car normally has a single-DIN head unit and thus required some extensive custom work to fit a Nexus 7. This meant I bought basically a whole spare radio cage/bezel, refitted the HVAC controls to where the ash tray normally sits, and built a custom mount for the N7. Unfortunately I never really took any "good" pictures, so hopefully these will do:

    Original concept:


    Progression of this design, including where the HVAC controller was relocated:




    Then in late August of 2013 I bought a 2001 Audi A4 (1.8TQM for those who know/care), so I pulled my N7 setup out of my 1998 Audi A4 and decided to make the next N7 setup better.
    This new setup is effectively like a double-in unit like another member did with his Subaru.
    A Metra dash kit holds a Radioshack project enclosure in place to the radio cage, and sits behind the N7. A vacuum-formed shell holds the N7 in place (white piece behind and to the sides of the tablet in pictures).
    My N7's hardware is completely unmodified, as one of my goals with this project is to be able to remove the N7 from the dash in a matter of seconds and use it as a normal N7. Also if my N7 were ever damaged, I could buy a new one, restore the latest backup from my current N7 (I back-up regularly), and install it without further modifications.

    Here is an early fitment picture:


    Clarion EQS746 takes the DAC output and converts it to front/rear/sub outputs with fader, volume, and sub level controls. And let's not forget its equalizer controls! (unfortunately it doesn't match my car's interior lighting, so I may replace it with a different EQ with red illumination in the future)


    And with everything except tablet and box wrapped with 3M Di-Noc carbon fiber vinyl, before also wrapping the shifter plate:


    Early install picture without the "double-DIN box" and showing off the rats nest which resides in the dash (factory wiring with the prior owner's crappy head unit wiring):


    And with the shifter plate wrapped and everything installed, also note the retractable micro-USB cable (connection to my Galaxy S3):


    Here's a picture of my custom power wiring harness:

    (added additional grounds where noted. This harness feeds the car's stock wiring harness)

    View from the backside of the custom "double-DIN box":


    And front-side view of the tablet/box combo:


    Some of the features I have or am planning include the following:
    -USB ROM for fully functioning charging + OTG, and many other features
    -USB DAC - Behringer UCA202
    -USB DVB-DT tuner dongle, for listening to FM radio using SDR Touch app
    -USB Easycap STK1160, for hooking up a reverse camera (in-progress)
    -additional front USB port for additional connectivity - USB flash drive, phone, charger port, whatever (it's connected to the USB hub)
    -extensive Tasker implementation, especially using Secure Settings
    -seamless automation for BT and USB tethering, including automatic switching between the two (in Tasker)
    -custom user interface - multi-picture wallpaper using Desktop Visualizer to create hotspots over the red icons I baked into the wallpaper using GIMP
    -N7 is removable from its mount in about 10 seconds and is 100% stock hardware-wise
    -uses as much factory wiring as possible (ON-signal is factory, and is powered whenever the key is ON including cranking!)
    -the front bezel is held on with magnets - this means easy removal and strong holding

    Here is a rough wiring/flow diagram:


    Let me know if you have any questions or comments! Thanks for reading.
    Last edited by MetalMan1; 12-18-2013, 11:14 AM.

  • #2
    how much is the magnet holding? great idea thinking about holding my LCD but does it fall at all during any hard bumps? if the magnet is strong enough it could start to interfer with the IC and otehr elect equip..

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    • #3
      When you ask "how much" do you mean cost? They are pretty cheap, actually, and come in lots of different sizes. I stockpiled on them so I had whatever I needed for my install.

      There are a series of mechanisms holding the tablet in place. The magnets only help hold in the fascia/bezel, and there are other clips that are part of the Metra pieces that hold things in place as well. For what they're doing, the magnets hold up great.
      And I've been using them for about a year now with seemingly no adverse affects. The tablet's internal GPS still works, though I'm not sure how accurate the internal compass is anymore haha.

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      • #4
        This makes me wish I didn't sell my N7...great looking setup!

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        • #5
          Thanks

          Over the last month or so I made more progress:
          -reverse camera set up, and mostly works now (using an older version of CarCam software until I'm satisfied with newer versions)
          -using aftermarket amplifiers, and ran new signal/power wires (this got rid of the hum coming from the speakers)
          -working right now on security, so the pattern lock will engage when I (my phone) am not present, and disable pattern lock when I am present

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          • #6
            Originally posted by MetalMan1 View Post
            Thanks

            Over the last month or so I made more progress:
            -reverse camera set up, and mostly works now (using an older version of CarCam software until I'm satisfied with newer versions)
            -using aftermarket amplifiers, and ran new signal/power wires (this got rid of the hum coming from the speakers)
            -working right now on security, so the pattern lock will engage when I (my phone) am not present, and disable pattern lock when I am present
            Any chance you could post a video of the reverse cam setup working?? Thanks!

            Comment


            • #7
              Originally posted by steev View Post
              Any chance you could post a video of the reverse cam setup working?? Thanks!
              Here's a quick video I took:

              http://www.youtube.com/watch?v=Lgio12Ob0eI

              Is there anything else you might be interested in seeing with regards to the backup camera?

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              • #8
                Originally posted by steev View Post
                Any chance you could post a video of the reverse cam setup working?? Thanks!
                Also just thought I would mention, this setup doesn't always work 100%. After some time CarCam doesn't come up when I'm in reverse, until I reboot the Nexus 7. Not sure if this is software (CarCam) or kernel/driver related.

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                • #9
                  Originally posted by MetalMan1 View Post
                  Also just thought I would mention, this setup doesn't always work 100%. After some time CarCam doesn't come up when I'm in reverse, until I reboot the Nexus 7. Not sure if this is software (CarCam) or kernel/driver related.
                  nice work man...
                  i have got a problem my easycap. when i connect directly my easycap to usg otg y cable it works perfectly but when using on usb hub it stops working and my hub is externally powered. is it happens to you?

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                  • #10
                    Hi, my setup doesn't seem to have the problem you're describing. My EasyCap is connected through a powered hub. It doesn't always work, but it always works after a reboot.

                    Comment


                    • #11
                      Hi,

                      It would be nice if you explained in more detail how you built that double din box.

                      Comment


                      • #12
                        Originally posted by MetalMan1 View Post
                        -reverse camera set up, and mostly works now (using an older version of CarCam software until I'm satisfied with newer versions)
                        Which is the chipset used in your EasyCap capture card? I have the UTV007 chipset and it works fine but it shows a lot of interlacing lines while the camera is moving, literally making it useless. Any idea about the possible workaround?

                        Comment


                        • #13
                          Originally posted by shadowmyst87 View Post
                          Hi,

                          It would be nice if you explained in more detail how you built that double din box.
                          Sure. Basically it's just a project box from Radio Shack:
                          http://www.radioshack.com/product/in...ductId=2062284

                          Then I drilled a bunch of holes in it, mounted the double-din brackets that came with the double-din mounting kit for my car, used double-sided adhesive-backed foam tape to secure the white shell onto one side, and filled the box up with stuff.
                          You can see the white shell in this picture:

                          The white shell is a vacuum-formed piece I made with a DIY vacuum forming machine, that gets put into the oven with a sheet of plastic until the plastic is soft enough.


                          Originally posted by CMS View Post
                          Which is the chipset used in your EasyCap capture card? I have the UTV007 chipset and it works fine but it shows a lot of interlacing lines while the camera is moving, literally making it useless. Any idea about the possible workaround?
                          My EasyCap is a STK1160 (the original).
                          Last edited by MetalMan1; 04-01-2014, 12:36 PM.

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                          • #14
                            Great work!!

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                            • #15
                              Just been reading through this with great interest as im collecting parts for my own N7 build.

                              My only question would be what are you using to charge the N7 and power the USB hub? I have plans to use a DCDC-USB-200 but if there's an easier way then im all up for it

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