These standard horn relays control my auto shutdown. When you turn your acc off, the PC knows via the serial port, it activates 'shutdown' and then when it's finished , it cuts the power to my inverter. My mate Paul wrote the service to monitor this and it works great. If anyone wants the software, I can send it.
Sample screen shots with Frodo and Ozi Explorer running. I also have Ozi configured so when I approach any 'fixed' speed camera, I get a verbal warning through my stereo system. If anyone wants the GPS co-ordinates of all fixed speed cameras in Melbourne, let me know.
Here's my GPS which I bought on eBay for about $80. Works terrific. Even through the window it has never lost signal. This way it doesn't get wet.
Each time I hop in the car I need to turn the screen on and then hit this button. This button and LED is directly wired to the PC on-off switch and power LED.
This is all the wiring going to the shelf. My problem is that because the shelf has to swing, I have to have all wires going in at the same place meaning that I have power and speaker wires together. I get a small bit of engine hum but im sure I can get rid of this with a bit more work..
And thats about it. It has been working great for a while now. Next on the agender is fitting a small webcam maybe as a reversing camera or maybe pointing forward recording constantly whats happening. this way when I hit my next kangaroo, i'll have it on film!
That's it so far. About a thousand hours in and no doubt about a thousand hours more. Eventually I will put a front and rear cover on the shelf, cover it in the same velour as the roof and maybe add a fan or two for cooling.
Using the 150W power inverter, everything runs fine and I have even run the whole system for over 3 hours without the car on no problem which surprised me.