Fusion Brain and Window Contorls

**Bxsteez** · 06-07-2008, 10:22 AM

Maybe i'm thinking this is too complicated but how would you hook up window controls? Would it just be a digital output connection? I don't know too much about car circuitry but does the resistance just increase as the physical resistance increases so the window stops trying to go up when its already at its maximum height?

**BLACKonBLACK98** · 06-07-2008, 10:45 AM

heh. i'm just gpoing to tag along with you.

i was wondering the same thing but was just gonna wait until i got it. is it possible for the outputs to act as a momentary switch?

actually i know the answer is yes since i have seen the air ride posts and whatnot. in for explanation.

*edit - just found the answer in a thread i had not seen before. the outputs are configurable to act as momentary switches, meaning power is only output while you are pressing the button. so basically you would just run the output through a relay and connect the 12v to the window motor, 1 for up, 1 for down. not sure how a negative switched setup would work, but they are less common.

**colin** · 06-07-2008, 11:07 AM

For a negative based setup, you would use two relays to trigger your window down switch. As if when you're engaging the relay, you're pressing the switch on your door panel.

**BLACKonBLACK98** · 06-07-2008, 11:18 AM

ahhh yes... makes perfect sense.

**2k1Toaster** · 06-07-2008, 11:27 AM

and for automated windows, put a current sensor on the motors. When current draw gets to about 150% of normal, it is fully up or down, so turn off output.

**Bxsteez** · 06-07-2008, 11:30 AM

Maybe its my lack of experience with car electronics but i'm slightly confused. So for window control you would need relays for both up and down operations? I assume this is because the window circuitry is a high current circuit? And negative the switched setup has completely confused me.

**2k1Toaster** · 06-07-2008, 11:31 AM

yes you would need 2 relays per window for most setups. Also 1 current sensor for each window you want to "auto"

**WuNgUn** · 06-07-2008, 11:41 AM

I would use load-sensing relays...they'll latch on until the load spikes, then shut off automatically. This way you don't need a feed-back loop into the Fusionbrain, just a pulse output...
Alternatively, you could use a Directed (DEI) 530T power window kit...
It'll control 2 windows both up and down...

When I get my HVAC setup in my front end, I plan on having the PC ask me if I want to roll the windows up when it senses I've turned on the A/C...
Maybe even a voice command to roll them up or down too?
Or speed sensitive roll up? The faster I go (monitoring GPS speed), the further the windows close, to limit noise and buffeting...

**colin** · 06-07-2008, 01:57 PM

Well first things first, do you want auto-up and auto-down. If yes, do your current window switches provide these functions? If yes, hook the relays up to the window switches, itll cost you almost nothing. If no, then you need to do current sensing and then things become a hassle...

**Bxsteez** · 06-07-2008, 02:02 PM

I'm thinking where i'm confused is the car circuitry itself. I've never really looked into how the windows actually go up and down. I just assumed it was a motor pulley system or something of that nature. maybe i should research the car end a little more