So I am about to undertake an awesome project. I want to mirror my Google Pixel phone to my CX-5 OEM head unit. I am really tecky but might need some help planning this project out. What I want to do is have a cable in my center arm rest. I get into my car, open the arm rest, plug in my phone, close the lid and my head unit would show a mirror of my screen, touches on the headunit would go to my phone. Sounds simple right?? LOL so here are my thoughts.
1. Getting video to the head unit. From my research if I want to use my OEM head unit my only option is to use the coax in on the back of the unit, there are 2 unused pins on the back of the unit for a backup camera, these pins are video signal and video signal ground. I would need to use a USB C to HDMI dongle to get the Digital video and audio out of my phone. Then from the HDMI I would need to take the video and audio and convert it to analog. They have cables that take HDMI to RCA video and audio for like 100$ CDN. This would get me video and audio to the back of the head unit. Now I would need to find the 12v wire that is triggered high when the car is in reverse. This will take some playing around with a volt meter but will be easy to fool once I find it. Ill just remove the cars signiling cable and replace it with my own 12v source that is fused, resisted and switched. I need to make it switchable somewhere to flip back and forth from my mirrored Android screen to the OEM head unit because normally the only time the backup camera is on is when the car is in reverse. If I just trigger it high all the time how do I get back to my head unit to do other stuff like turn on the radio or change car settings. Also if someone is using the car without a phone and wants to use it normally. I almost want it to default to head unit unless I press this button to turn on mirroring. so a relay that defaults to 0v when powered but when toggled holds 12v. That way when you power the car off it will default back to the OEM screen. My idea is to put a nicely placed push switch in the center console or something close to the driver to toggle. Unless someone has a better idea how to switch from one mode to the other.
2. Audio: The head unit will still function properly for audio even with the backup camera interface on. So I have a choice of Bluetooth or Aux in. The CX-5 has a horrible 2 second lag with Bluetooth audio from it so I am thinking of using the RCA audio off the HDMI cable from step 1. Why go wireless if there is a cable there already. I know it's not digital but this is just simple audio not a 5.1 around system. Any idea how to get the analog audio into the stereo? Should I just vampire tap the existing aux input on the back of the head unit and feed my audio in from the HDMI cable?
3. Getting touches from OEM screen to my Android device: I will be buying one of these puppies http://www.customgadz.com this unit will take touches from my OEM screen and send them like a mouse click to my Android screen. It just acts like a simple HID device over Bluetooth. Very cool device if it works!
Any thoughts or ideas on this project I would love to hear it. I'll be posting updates and pictures here as I do stuff.
1. Getting video to the head unit. From my research if I want to use my OEM head unit my only option is to use the coax in on the back of the unit, there are 2 unused pins on the back of the unit for a backup camera, these pins are video signal and video signal ground. I would need to use a USB C to HDMI dongle to get the Digital video and audio out of my phone. Then from the HDMI I would need to take the video and audio and convert it to analog. They have cables that take HDMI to RCA video and audio for like 100$ CDN. This would get me video and audio to the back of the head unit. Now I would need to find the 12v wire that is triggered high when the car is in reverse. This will take some playing around with a volt meter but will be easy to fool once I find it. Ill just remove the cars signiling cable and replace it with my own 12v source that is fused, resisted and switched. I need to make it switchable somewhere to flip back and forth from my mirrored Android screen to the OEM head unit because normally the only time the backup camera is on is when the car is in reverse. If I just trigger it high all the time how do I get back to my head unit to do other stuff like turn on the radio or change car settings. Also if someone is using the car without a phone and wants to use it normally. I almost want it to default to head unit unless I press this button to turn on mirroring. so a relay that defaults to 0v when powered but when toggled holds 12v. That way when you power the car off it will default back to the OEM screen. My idea is to put a nicely placed push switch in the center console or something close to the driver to toggle. Unless someone has a better idea how to switch from one mode to the other.
2. Audio: The head unit will still function properly for audio even with the backup camera interface on. So I have a choice of Bluetooth or Aux in. The CX-5 has a horrible 2 second lag with Bluetooth audio from it so I am thinking of using the RCA audio off the HDMI cable from step 1. Why go wireless if there is a cable there already. I know it's not digital but this is just simple audio not a 5.1 around system. Any idea how to get the analog audio into the stereo? Should I just vampire tap the existing aux input on the back of the head unit and feed my audio in from the HDMI cable?
3. Getting touches from OEM screen to my Android device: I will be buying one of these puppies http://www.customgadz.com this unit will take touches from my OEM screen and send them like a mouse click to my Android screen. It just acts like a simple HID device over Bluetooth. Very cool device if it works!
Any thoughts or ideas on this project I would love to hear it. I'll be posting updates and pictures here as I do stuff.
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