Updated:
Let me start off by stating that I am a self-admitted electronics n00b. In my feeble little mind, this concept works, but I'm almost certain that it has fundamental flaws.
How it "works" (or does in my mind):
Startup- Power is fed from the battery to a relay, to the inverter, and than to the computer. When the ignition is turned on, the relay opens the switch from the battery to the inverter, and the computer is set to power on after powerloss and turns on.
Shutdown- The computer is set up with a "generic" UPS that shuts down when power is not supplied to Serial Pin 8 of the computer.
The ignition switch is connected to pin 8 (Voltage, amperage is lowered to 5v and w/e amps {idk, im dumb, remember?}). When the ignition is switched off, it prompts the computer to shutdown automatically.
There should be an approximatly 1 minute delay before the ignition power to the relay is shutdown, and thus shuts down the power to the inverter and the rest of the system (idk how to do this either, or if it is possible).
Knowlage that has led to this idea:
Quote:
A relay is just an electrical switch i.e. instead of you flicking the switch with your finger, a 12v supply flicks it. So when you turn your car on, the accessory wire gets 12v, this flicks the switch (relay) on, the connection is made, 5v from the psu connects to pin8. When you turn your car off the reverse happens.
^I don't completely understand because of the 5v from ps to pin 8. That wouldn't shutdown the computer, because it is the computers p/s. Seems right for the startup part though.
Idea for fake UPS from:
http://www.cynian.net/index?name=car...iddle=carputer
also more info:
http://www.mp3car.com/vbulletin/show...light=fake+ups
Thanks Laidback
Also if this is possible what kind of relay and other parts would i need (meaning 1 min delay thing, and deal to lower voltage, please link, and give specifics)
