s2kguy123

So. I decided to finally cut my dashboard and install a display. Instead of putting in navi I decided to get mini android computer. While wiring it up I ran into a small problem and need your help to figure out a solution. Pic below shows the schematics of how the wires go. Ignition wire causes relay to send 12v to power up computer an display. Ignition signal also sends an accessories signal to turbo timer which turns it on. Idea here is to have turbo timer power on android for additional time to give it time to power off on its on instead of abruptly cutting power from it. When you power off the car, loss of ignition signal takes away power from android. At the same time loss of accessories signal tells turbo timer to start counting down which feeds power back to android for specified time. Now the problem I have is that when you turn off ignition, there is power loss to android for like a millisecond which causes it to restart. This occurs due to relays both switching at the same time. I need to find a way to somehow delay the loss of signal to one of the relays to allow turbo timer to kick in or maybe there is more efficient way to wire it all up.

acid2000

Hi mate i dont know if you have this problem sorted but i may have a solution for you.
I had the same issue with the external hard drive on my car pc. So i installed a delay power off timer, it basically delays the power off to a device and is full adjustable.



i dont know if it will help but its very simple to make and the parts are very cheap.

Hope it helps

stupkid

I would use a 555 timer and run it off the acc line. Or try using a capacitor and resistors to make a delay shutoff.