Thought I'd share my latest project - Android integration into the OEM nav screen. Basically I wanted and android head unit whilst also keeping the cars original interface and menus. This way I could keep the use of my intravee, the cars radio and bluetooth which is much better quality than those in the android head units.
I started out by researching what video signal is provided to the OEM board monitor which turned out to be RGB which I could access from the TV module. As my intention was to replace the LCD in the board monitor with a higher resolution panel with touchscreen I would need to convert this to VGA. In order to do this a converter board would be required so I sourced one to test before committing to ordering the other components.
I had to make an interface cable to connect the RGB siganal to the converter board which can be seen below and as you can see this was a success!
Once I'd got the video signal converted I worked out the basic layout of what components would be needed and how everything would connect up
I decided to use an Odroid C2 as the android device as it seemed quite customisable and sufficiently powerful for the application. I found the 6.5" screen with driver and touch overlay on eBay.
As the screen was coming from china this gave me plenty of time to work out the exact wiring required and where everything would connect:
Once everything had arrived I started by removing the boot carpet and routing the wiring through, HDMI for android, VGA for the MK4 Nav, one composite for the reverse camera and the other as the trigger wire and then the USB for the touch screen:
I set about disassembling the board monitor and adapting it for the new screen. As the CD drive in it would not longer be usable I decided to rewire the eject button to act as the input change on the new screen allowing me to switch between the VGA and HDMI. I also installed the Infra red receiver for the screens remote in place of the light sensor in case I wanted to make alterations to the screens settings:
Once I'd completed the screen it was just a case of setting up android and enabling USB touchscreen support on the Odroid C2. I've now got fully functional android as well as the original car systems which looks completely OEM from inside. I've also got the use of 'OK Google' enabling me to use my voice to play music and navigate etc. Here's a quick video of it in action:
I'm really pleased with how it's turned out, what do you guys think?