Best way to plug in audio jack ?

[Jvt]

Hi.

I have a Yaris TS from 2001. I bought it 3 months ago, it is my first car, and I really like it! :)

What I like a bit less is the old cassette/audio-cd system. I'm planning to install a car computer, using a Raspberry Pi that I just bought, and a touch screen. Maybe I'll add a reverse camera, a GPS module, a USB Wifi adapter, ... So it will cost me some money, but I want to do it for the DIY fun.

I'm kind of good with computers, but not so much with cars... The first big problem that I can see is for the audio connection. I have two options to get sound from the computer :

• A 3.5mm audio jack port.
• An HDMI port, that will be used to connect to the screen, but from which I could also get the audio, using a device like this one.

Now I have no idea how to plug it to my car speakers, and that's why I thought you could help me. What are the options, and what are their advantages/disadvantages ?

Here is a picture of the center console, if it can help.


Thanks.