Landing gear lights

jparia · May 7, 2026 at 8:29 PM

Hello,

I'm trying to control the on/off function of the lighting mounted on the nose landing gear leg using the landing gear retraction control.

It works, but the lighting turns on when the landing gear is retracted.

Code

//dynamics

<[string8][object][output]
  <[string8][Name][LightsGear]>
  <[string8][Input][RetractsInput.Output]>
>

//Graphic

<[string8][object][graphics_input]
  <[string8][Name][GearLightsInput]>
  <[string8][InputID][LightsGear.Output]>
>
<[string8][object][graphics_mapping]
  <[string8][Name][GearLights]>
  <[string8][Input][GearLightsInput.Output]>
  <[float64][Map][ (0 0) (1 1) ]>
>
<[string8][object][graphics_pointlight]
  <[string8][Name][FrontGearTipNavigationLight]>
  <[uint32][PositionID][FrontGear.R]>
  <[uint32][OrientationID][FrontGear.Q]>
  <[tmvector3d][R0][ 0.7687 0 -0.1227  ]>
  <[tmvector3d][X0][ 0 1 0.5 ]>
  <[tmvector3d][Color][ 1 1 1 1 ]>
  <[float64][ConeCenter][0.0]>
  <[float64][ConeCutoff][-0.8]>
  <[float64][Brightness][25.0]>
  <[float64][Size][0.006]>
  <[string8][InputModulation][GearLights.Output]>
>

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Jet-Pack (IPACS) · May 7, 2026 at 9:05 PM Official Post

Perhaps the retracts input that you are using is also used to move the gear? So for state 0 the gear may be down and for 1 it's actively pushing the gear up into the retracted state. So what you will have to do is logically invert the signal.

jparia · May 8, 2026 at 12:09 PM

thank you jet-Pack,
i added au new gear sequence for ligthting gear

it' work now

Code

		<[string8][object][servolinear]
            <[string8][Name][ServoGearSequence]>
            <[string8][Input][RetractsInput.Output]>
            <[float64][Position][-1]>
            <[float64][OutputSpeed][1]>
            <[float64array][InputPosition][ -1 0 1 ]>
            <[float64array][OutputPosition][ -1 0 1 ]>
        >
		<[string8][object][servolinear]
            <[string8][Name][ServoLightGearSequence]>
            <[string8][Input][RetractsInput.Output]>
            <[float64][Position][0]>
            <[float64][OutputSpeed][1]>
            <[float64array][InputPosition][ 0 0 1 ]>
            <[float64array][OutputPosition][ 1 0 0 ]>
        >
        
        <[string8][object][output]
            <[string8][Name][LightsGear]>
            <[string8][Input][ServoLightGearSequence.Output]>
        >

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Jet-Pack (IPACS) · May 8, 2026 at 12:12 PM Official Post

Instead of input position 0 0 1 and output position 1 0 0 try it with 0 1 and 1 0.

Otherwise you have defined the input 0 twice, once with output 1 and once with output 0, which is logically incorrect and can cause unpredictable behavior.

Mathematically speaking the list of values in the input array must be strictly ascending. No two inputs must be the same.

Landing gear lights

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