Buttons on my dash to turn on my car amplifiers

**ATT41** · 04-03-2009, 03:13 AM

Ok, so I am using the FB at the moment to trigger outputs (relays) for my amplifiers.

I want to use a spare switch in my car's dash to do the same thing (as if I were clicking the button on the screen to turn on/off an output).

The switch in my dash seems to only complete the circuit when the button is being pressed, once I stop pushing down the button, the circuit it broken.

So I want MDX to change the output status as if the button is like a "down click vote" and not change until the next "down click vote"

Hope this makes sense.

**Crinos** · 04-03-2009, 03:29 AM

Not quite sure of what you are trying to do here...

Just to clearify...
You want a hardware button, to do the same task as a software button via FusionBrain does?

If so the case, you need a button that sends a puls signal while beeing pressed. then a system that register the puls, and have a memory of on/off state, and out of that a logic that sends a solid 12V to amp if "on" and cut the signal if "off".

Now.. This might seem a bit more complicated than it realy is... There are some stores where you can buy a logic relay that can do this task for you.

How this will work togeather with FusionBrain... I have NO clue off..

**ATT41** · 04-03-2009, 03:54 AM

hmmm... not quite.

I think what I am trying to say is, I want an output to be triggered by an input.

Once the input is active (lets say 12v) the FB will trigger an output.

**ATT41** · 04-03-2009, 04:16 AM

OK, I think I am getting somewhere now,

using a new root function that will trigger a predefined output if a certain input is greater than 5v (I now realise you can have a input with 12v)

gotta play around with it a bit though.

**greenman100** · 04-03-2009, 09:52 AM

Originally Posted by ATT41

(I now realise you can have a input with 12v)

do not do this. 5v is the max.

**ATT41** · 04-03-2009, 11:01 AM

oh ****, I meant to say can't,

but it appears I have found a way to do it. I'm going to have an input logic "if > 2v, vote amp relay on",

and I will have a second button in may dash that will do the same, except amp relay will turn off.

just need to find a 5v source somewhere tho...

**greenman100** · 04-03-2009, 11:03 AM

Originally Posted by ATT41

oh ****, I meant to say can't,

but it appears I have found a way to do it. I'm going to have an input logic "if > 2v, vote amp relay on",

and I will have a second button in may dash that will do the same, except amp relay will turn off.

just need to find a 5v source somewhere tho...

take it off the FB analog inputs

**2k1Toaster** · 04-03-2009, 11:08 AM

Originally Posted by ATT41

Ok, so I am using the FB at the moment to trigger outputs (relays) for my amplifiers.

I want to use a spare switch in my car's dash to do the same thing (as if I were clicking the button on the screen to turn on/off an output).

The switch in my dash seems to only complete the circuit when the button is being pressed, once I stop pushing down the button, the circuit it broken.

So I want MDX to change the output status as if the button is like a "down click vote" and not change until the next "down click vote"

Hope this makes sense.

The virtual button in MDX acts like a momentary, or the physical button?

If you want the button to act like a latch, then have the button input increment a variable. Set the minimum time between votes to something like a second or more. Then another logic that says if the variable is 1, turn on output. Another for if variable >= 2, variable = 0. That will latch.

**ATT41** · 04-04-2009, 12:14 AM

Great!

Makes sense, but I'm having trouble making MDX do that.

The first input logic will be "if amp switch is > 2v, then change variable +1"

it seem that when I punch that it, it doesn't add 1 to the variable value, it replaces it with the number 1.

Or am I doing something wrong? - I can host the config file if it helps?

**ATT41** · 04-04-2009, 01:36 AM

Looks like I have figured out a way to do it

For anybody else trying the same thing, this is what I am going to test with my FB (seems to work fine with the virtual brain so far).

Only problem I forsee is holding the button down too long. but I shouldn't be holding the button for longer than 1 second I suppose.