M1-ATX switch problems

**paulbin** · 12-11-2005, 11:52 AM

Im running my car pc on a M1-ATX and ive put the ignition connector onto a simple on-off switch.

Ive got one side of the switch going to the + on the battery then the other side of the switch going to the ignition connector on the M1-ATX, therefore the switch should act as a 'Ignition switch' in the car.

But the problem is that it doesnt, i have to click the switch a few times to get the power on and wen i try and turn it off nothing happens at all, i have to turn the computer off manually.

Anyone know wots going on with my M1-ATX?

**DarquePervert** · 12-11-2005, 11:57 AM

The IGN shouldn't be going to the battery at all. It should be going to the IGN wire or an ACC wire. It's only a sense wire.

Realistically, I'd think you'd want the switch on the hot line fromt eh battery so that if you don't want the computer to come on, you'd simply turn the switch tot he OFF position, preventing power from getting to the motherboard.
Then the pulse from IGN wouldn't turn anything on.

**paulbin** · 12-11-2005, 12:02 PM

but wot ur saying is that i need the switch to be more of a pulsing switch more than an on-off switch?

**DarquePervert** · 12-11-2005, 01:49 PM

No.
I'm saying two things:

1) The IGN line should be going to a switched line like ACC or IGN, not directly from the battery.

2) You should switch the constant 12v line, not the IGN line.
When the switch is open (in the off position), the M1-ATX will receive the pulse, as normal, but since there is no power, it won't be able to do anything.
When the switch is closed (on opsition) and it receives the pulse on the IGN line, it will intiate startup of the PC.
It will work very much like a valet switch.

**paulbin** · 12-11-2005, 04:11 PM

so why cant i use a switch to replicate the ignition switch

and what is ACC?

**azzurro** · 12-11-2005, 04:58 PM

Originally Posted by DarquePervert

No.
I'm saying two things:

1) The IGN line should be going to a switched line like ACC or IGN, not directly from the battery.

2) You should switch the constant 12v line, not the IGN line.
When the switch is open (in the off position), the M1-ATX will receive the pulse, as normal, but since there is no power, it won't be able to do anything.
When the switch is closed (on opsition) and it receives the pulse on the IGN line, it will intiate startup of the PC.
It will work very much like a valet switch.

Why not just switch ignition?

This works perfectly fine, and you can use a less heavy-duty switch.