Multiple projector switching using variables?

dmenke · August 2009

Good Morning.

I have a classroom with 2 projectors, and need to be able to display multiple sources to each of the projectors at different times. I could create popup pages with different channel source buttons, and have multiple button events for each button unique to each projector, but I would like to be able to send a command to each projector based on which projector is selected on the projector select button.

Confused?

I'm using a module to control the projectors, and all that is working OK, I just want to choose the projector responding to a command with a variable set by a projector selector button. I was thinking of something like this: (I found this code elsewhere on the list, as an example)

DEFINE_DEVICE
dv_proj_1 = 5001:01:0 // proj one
dv_proj_2 = 5001:02:0 // proj two

DEFINE_VARIABLE

volatile dev dev_proj_sel[]=
{0,1}

volatile dev dev_projs[]=
{
dv_proj_1
,dv_proj_2
}

DEFINE_EVENT

button_event[dev_TP,1] // power on
{
push:
{
local_var integer pj_id
pj_id=get_last(dev_proj_sel)
send_command dev_projs[pj_id],'commence_world_takeover'
}
}

Is there a better way, or will this work?

Doug Menke

jjames · August 2009

I wouldn't use GET_LAST to a button event outside of itself. But your idea is right on . . . try something like this:

DEFINE_VARIABLE
VOLATILE INTEGER nCUR_PROJ;

DEFINE_EVENT
BUTTON_EVENT[dv_TP,nPROJ_SEL_BTNS]
{
	PUSH:
	{
		// Select which project we want to control
		nCUR_PROJ = GET_LAST(nPROJ_SEL_BTNS)
	}
}

BUTTON_EVENT[dv_TP,nPROJ_POWER_ON]
{
	PUSH:
	{
		IF(nCUR_PROJ) // Send command only if a projector is select
			SEND_COMMAND vdv_PROJ[nCUR_PROJ],'TAKE OVER WORLD'
		ELSE // Otherwise send annoying double beep
			SEND_COMMAND BUTTON.INPUT.DEVICE,"'ADBEEP'";
			
	}
}

Or you could set a DEV variable and set it like so:

DEFINE_VARIABLE
DEV vdv_PROJ_SEL;

BUTTON_EVENT[dv_TP,nPROJ_SEL_BTNS]
{
	PUSH:
	{
		// Select which project we want to control
		vdv_PROJ_SEL = vdv_PROJ[GET_LAST(nPROJ_SEL_BTNS)]
	}
}

BUTTON_EVENT[dv_TP,nPROJ_POWER_ON]
{
	PUSH:
	{
		IF(vdv_PROJ_SEL != 0:0:0) // Send command only if a projector is selected
			SEND_COMMAND vdv_PROJ_SEL,'TAKE OVER WORLD'
		ELSE // Otherwise send annoying double beep
			SEND_COMMAND BUTTON.INPUT.DEVICE,"'ADBEEP'";
			
	}
}

There are MANY different ways you can do this.

John Gonzales · August 2009

Also, you'll need to change

volatile dev dev_proj_sel[]=
{0,1}

to:

volatile dev dev_proj_sel[]=
{1,2}

The 0 will act as a wildcard and will be true for any button pushed during the button event that jjames listed.

--John

John Gonzales · August 2009

Actually you'll need to change the dev_proj_sel[] to a unique set of button numbers or to a unique port on the TP for the button event of the projector selection.

--John

jjames · August 2009

I didn't notice this the first time around but you'd need to change your definitions from:

volatile dev dev_proj_sel[]=
{1,2}

to

volatile integer dev_proj_sel[]=
{1,2}

I'll just guess oversight on your part. But John is correct, the zero would act as a wildcard.

Good luck and let us know how it turns out!

Multiple projector switching using variables?

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