[Android Auto General] yoiedi:
Hello guys, I'm planning to build my first carputer. 2 years ago I have modified a tablet, Asus zenpad 8, very similar to Nexus 7 in my opinion. Now I want something more.

What I want:

Fully automated pc that works exactly like an android head unit but much better and more flexibility when it comes to external devices like an external DAC with optical output. Actually this is the main reason for not buying an android head unit, didn't find one that works very well with an external DAC. Some other things that I want from this carputer: the compatibility with steering wheel controls, backup camera, fm or even DAB radio, gps, phone calls( via bluetooth), 4G internet and so on. Many of those things are pretty simple to integrate, will talk about them later.

The components:

1. The pc - didn't think about it yet because there are loads of mini pc on the market for good prices. The only problem I'm thinking is the start up on ignition. First I wanted to go for a Remix mini pc but I don't know how could I make it start on ignition and after that automatically play the last song. If I would go for a normal PC, I found a smart PSU which has the possibility of ignition start and stop and puts the computer in sleep mode. That way I will avoid the waiting time for the boot, in fact the computer will be permanently turned on. The only problem I can think of, is the compatibility of this PSU with the android Remix OS. Is it possible?

I've tested the Remix OS and I like it, very quiq, easy to use in car with a touch screen, support all the external devices( wifi, 4g, fm and DAB, external DAC with optical output) and the launcher can be changed. I know I can opt for Windows OS and that way I will be sure that the PSU works but in my opinion windows is not so "mobile friendly", not so easy to use in car.

2. The screen: not so many to talk about, found on ebay some 9" tft touch screens, very good resolution, hdmi connectivity and USB for touch. The best thing with these screens is the AV2 input for the backup camera. The screen automatically switch to this input, has guidance lines, and this way I solved the problem with the camera. And also is quite cheap.

3. Steering wheel controls. Found on ebay the Joycon steering wheel adapter that is compatible with Android. I just have to make an initial configuration and that's it, nothing more, simply works through USB.

4. The other external devices: all of them can be found on ebay for good prices. The only thing that worries me is the bluetooth compatibility. I remember when I built that Asus zenpad tablet, I couldn't find a solution for this. Now my question is, what type of bluetooth adapter should I buy and how do I integrate this in the carputer. And I'm not talking about physical connection, I think I will need some kind of software, app, that knows what to do with this bluetooth adapter.

So, in the end, I would need some help regarding the ignition start, just the hardware part of it, all the other automatic things (launch the app and play the song) can be made with tasker very easy. Also I would need some help with the bluetooth phone calls.

Hope I didn't miss any important thing and I will appreciate any help. Thanks.