Car computer on/off

[tipoil17]

Hi
I searched google but i cant find anything about what i want to do.
i was wondering if there is a way to make a 12v computer turn on and off using the car signal wire. so if i turn on the car it boots the computer and if turn off the key, the computer would shutdown and not just cut the power?

 

[greens]

On is easy enough and could be done in a bunch of different ways.

Off on the other hand... If it isn't a FAT 32 drive (which it wouldn't be) there shouldn't be any problem with a hard shut down, really.

I can't think of any way to tell the PC to shut down without pressing an additional button or flipping a switch. When the power cuts off it is too late to shut it down, so you can't really do anything - you turn the key and the car is off, too late for the PC to shut down. The only thing i can think of is to have a secondary relay of some kind that, upon power off of the car, allows it to use the battery to complete the shut down.

 

[ikaz]

Maybe look into some sort of mini UPS so when the Car turns off the ups kicks in and sends a shutdown command I think APC units can do it.

http://www.howtogeek.com/howto/33776/powerchute-makes-managing-your-apc-ups-easier-during-power-outages/