unusual shutdown controller
I have a computer that is designed to run on 8 to 30 volts, which is great for a car but I'm having trouble finding a shutdown controller for it. It can be made to hibernate via one of the serial ports, so what I need is something that will close 2 relays when the ignition is turned on, when the ignition is turned off I'd like it to count about 10 minutes or so and open the first relay which will tell it to hibernate and after about a minute open the second relay to cut the main power. Having low voltage sense and a way to control it manually would be nice too. Any ideas?