help scripting rotory switch

[ashere 0]

hi just started writing modules . would like some help scripting a rotory switch controlled by a Lvar variable with 4 positions.

 

in the tracer when the switch is rotated up it reads

                                                                                ERP_ATR=1

                                                                                ERP_ATR=2

                                                                                ERP_ATR=3

                                                when rotated down

                                                                               ERP_ATR=2

                                                                               ERP_ATR=1

                                                                               ERP_ATR=0

 

how can I script this to operate the switch going up and down through the cycle

 

thanks for any help

[ScotFlieger 280]

Hi ashere

 

Before I can better answer your question can you say which aircraft you are using, what rotary switch you plan to use, where you got the Lvar variables from and what your level of programming skills and knowledge of LUA are?

[ashere 0]

hi the aircraft is atr 42 by virtualcol and the swich is the mct control for config engines. the Lvar variables are from the linda tracer when the switch is operated with the mouse. don't know much about programming and lua and have done most of the other controls looking at other aircraft scripts and coping.

[ScotFlieger 280]

hi the aircraft is atr 42 by virtualcol and the swich is the mct control for config engines. the Lvar variables are from the linda tracer when the switch is operated with the mouse. don't know much about programming and lua and have done most of the other controls looking at other aircraft scripts and coping.

 

I have not been able to identify the MCT Control through Google. Do you have a link? How does LINDA see the device and how is the rotary switch up/down selection operate? Does LINDA see separate up or down movement or are there discrete positions?

[ashere 0]

have done some checking and there may be a bad translation in the manual , have checked other planes and the switch is called pwr mgt .

 

in the sim with the switch at the position when you first load . when you mouse click once and check the variables erp_atr moves to erp_atr=1 when you rotate again it moves to erp_atr=2 then erp_atr=3. that is full . going the other way it reads erp_atr=2 then erp_atr=1 then erp_atr=0 this is full back

[ScotFlieger 280]

have done some checking and there may be a bad translation in the manual , have checked other planes and the switch is called pwr mgt .

 

in the sim with the switch at the position when you first load . when you mouse click once and check the variables erp_atr moves to erp_atr=1 when you rotate again it moves to erp_atr=2 then erp_atr=3. that is full . going the other way it reads erp_atr=2 then erp_atr=1 then erp_atr=0 this is full back

 

I can understand how the Lvar is increasing when you operate the switch with the mouse.  The question we need to answer is how you wish to operate the Power Management (Pwr Mgt) switch using LINDA.  Do you want to press a button on a device/joystick to increase and press another to decrease?

 

I think you are looking for code similar to this.

 

--  To increment the ERP value:

 

function ATR_ERP_inc

     local Lvar = "ERP_ATR"

     local erp = ipc.readLvar(Lvar)

     erp = erp +1

     if erp > 3 then  erp = 3

    ipc.writeLvar(Lvar, erp)

end

 

-- To decrease the ERP value

 

function ATR_ERP_dec

     local Lvar = "ERP_ATR"

     local erp = ipc.readLvar(Lvar)

     erp = erp +0

     if erp < 0 then  erp = 0

    ipc.writeLvar(Lvar, erp)

end

 

Assign the ATR_ERP_inc function to the button you want to increase the value and the ATR_ERP_dec to the button you want to use to decrease the value.

[ashere 0]

hi thanks for the help struggled to get this to work and found another script that works posted below .

 

function ERP_atr_inc ()

 

    local t = ipc.readLvar('ERP_atr')
    t = t + 1
    if t > 3 then t = 3 end
    ipc.writeLvar('ERP_atr', t)

 

end

​

I don't know programming so try to look at other scripts and adjust them to work for me .

 

also how do I upload my modules which are basic and mostly use fsx default with a few Lvar functions .

[ScotFlieger 280]

hi thanks for the help struggled to get this to work and found another script that works posted below .

 

function ERP_atr_inc ()

 

    local t = ipc.readLvar('ERP_atr')

    t = t + 1

    if t > 3 then t = 3 end

    ipc.writeLvar('ERP_atr', t)

 

end

​

I don't know programming so try to look at other scripts and adjust them to work for me .

 

also how do I upload my modules which are basic and mostly use fsx default with a few Lvar functions .

I am glad to got the function to work and learned a little along the way. The main lesson is that LUA is case sensitive. I used the uppercase Lvars you quoted - it appears that it uses upper and lowercase.

 

The best place for these functions is the new actions.lua or users.lua file for your aircraft located in /FSX/modules/Linda/aircraft/ATR (or something similar). If you are using FSX default, these will appear in LINDA as green assignments.