I have decided to redo the first Raspberry Pi powered dash, you can check it out in action here. The first version was powered by a Raspberry Pi 2 B+ and used a 7″ Tontec touchscreen display. It also featured a 3 3/8″ Autometer Pro-comp 160mph mechanical speedometer and a 2 5/8″ Autometer Pro-comp fuel gauge. Since I have now swapped to a 4L80e transmission, the speedometer will no longer work. So instead I am going to do away with it entirely and integrate the speedometer into the digital display using the Megasquirt and the Microsquirt.
First testing with the 7″ Tontec display for version 1.0
I was never really happy with the screen solution as it lacked any real means of mounting and I had to come up with a sandwich style mounting system, which worked but I always felt was clunky. So i will be replacing it with the official 7″ Raspberry Pi touchscreen display. Which has the touch overlay much more integrated and also provides a rear mounting system for not only the display, but the Raspberry Pi itself to the back of the unit.
It can either be powered via USB, dedicated power supply or by the GPIO pins on the Pi. I will be powering it via the GPIO pins for a cleaner install. It also will connect to the Pi via a ribbon cable to the DSI port on the Pi. This is a much more compact and cleaner connection solution than using a short HDMI cable which still has the issue of bulky connectors to deal with.
I also ordered this slick RS Premium case to go with it. It gives me a nice mounting solution and still lets me mount the Pi to the back of it. Instead of mounting it behind the dash face as with version one of the build, this will be mounted on the dash face.
Below is the technical drawings for the display itself with the exact dimensions. This was also something I was lacking with the Tontec display. While not a deal breaker, it is nice to have and makes custom fabbing of panels and mounting much easier.
You can download the pdf file here.
On thing I am also trying to integrate is a second, independent display connected to the Pi. This would most likely be a small 4″ or 3.5″ display mounted where the mechanical speedometer once was. This would serve as an area to display info such as boost, or other vitals that I would like to have prominently displayed at all times. I am not fully sure this is possible, though I am told with some scripting it is, we shall see. I will have more updates when the new parts arrive and work begins.