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I am in total aggrement with you. I brought this up mainly for those who might want to do something similar but lack the time or experince to tackle someting like this. I also had no experience with the PIC 6 months ago. I was also going to build my own as you have done, but my main interest was getting my carPC up and running reliably since the OPUS 120 PSU built in controller was not reliable. I also thought about problems later and having to troubleshhot and repair the parts I built. I now have spare parts for everything, even a OPUS PSU that I thought was bad, but ending up being a short on the motherboard.
I have added inputs for the ACC/RUN switch, remote door unlock, remote door lock, door open, OPUS/CPU reset and Valet switch
My outputs control the OPUS idle/power mode, CPU power on/off, CPU reset, XM Radio Module power, Xenarc TS Power
With this I/O I have complete control over my PC. for example:
Normally either the remote unlocking the door or the door being opened will start the PC, but If I don't want my PC to start from pressing the remote open or door being open I press the remote lock and then within 1.5 sec I press the unlock, the PC will not start until the ACC/RUN switch is turned on.
This was added when I found that while cleaning the car I was constantly opening and closing the doors.
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