Using two outputs to simulate Boeing Vavles with an Open cockpits card(s) and Prosim737

Where Phidgets have the function to adjust the brightness of LEDS using software, the Open cockpits cards lack it. That is a bit of a bummer when trying to simulate the gauge valve lights.

But, there is a work around.... for each gauge you need two outputs, on each output a resistod for the led and a diode. The diode ensures that the current from output A does not interfere with output B and the other way around.

I splashed these together:
http://www.737ng.eu/070210/junction1.jpg

Once wired up I created the following bit of code for each gauge.

//Define Gauge movement

var 800 name CowlValveRight, Link IOCARD_OUT, Output 75 {
if v800 = 2
{
v775 = 1
v776 = 1
}
ELSE
{
v775 = 1
v776 = 0
}
}

The Prosim737 software sends either a 1 or a 0 to IOCP to indicate light state (off/on) and a 2 when the output in question is a valve. So I created a var (800) which represents the LED for the valve. Depending on weather a 1 or a 2 is sent the valve light is either dim or bright. You will have to play around with resistors though, Initially the difference between dim and bright was minimal, Now I have other resistors and I will be adding them soon.

Hope this helps, ... if anyone has any questions, please feel free to ask!

Just a quick change to the code:

// Cowl Anti Ice
var 800 name CowlValveRight, Link IOCARD_OUT, Output 75
{
if v800 = 2
{
v775 = 1
v776 = 1
}
if v800 = 1
{
v775 = 1
v776 = 0
}
if v800 = 0
{
v775 = 0
v776 = 0
}
}

Just making sure that the light is turned off if there is no signal coming through, . it seemed to stay on ofter two cycles of the valve, .. but working perfectly now.