WAYPOINT ALERT HSI FLAG

[G.Franco 0]

I'm using a.XML editor and if spaces are needed it advices me.

Gianfranco

[phjvh 0]

OK,

 

For fun tested your code and this works perfect:

 

 

<Element>

<Position X="0" Y="200" />

<Select>

<Value>

(A:sim on ground,bool) !

if{

(A:GPS WP ETE, minutes) 2 <

(A:GPS IS ACTIVE WAY POINT,bool)

(A:ELECTRICAL AVIONICS BUS VOLTAGE, volts) 10 >

and and

if{ 1 }

els{ 0 }

}

els{ 0 }

</Value>

<Case Value="0"><Image Name="wpt Alert1.bmp" Bright="yes"/></Case>

<Case Value="1"><Image Name="wpt Alert2.bmp" Bright="yes"/></Case>

</Select>

</Element>

[G.Franco 0]

Hi Jan,

your corrections to the code have been the right solution. Now the ALERT Light on my HSI works properly on ground and in flight.

Thank you very much indeed.

Gianfranco

[n4gix 4,947]

In that case then, let me repost the XML script the correct way for posterity:

<Element>
 <Position X="0" Y="200" />
 <Select>
   <Value>
     (A:sim on ground,bool) !
     if{
       (A:GPS WP ETE, minutes) 2 <
       (A:GPS IS ACTIVE WAY POINT,bool)
       (A:ELECTRICAL AVIONICS BUS VOLTAGE, volts) 10 >
       and and
       if{ 1 }
       els{ 0 }
       }
     els{ 0 }
   </Value>
   <Case Value="0">
     <Image Name="wpt Alert1.bmp" Bright="yes"/>
   </Case>
   <Case Value="1">
     <Image Name="wpt Alert2.bmp" Bright="yes"/>
   </Case>
 </Select>
</Element>          

[G.Franco 0]

Bill,

that's the right code .I would like to know ,just for learning, the why of code after " and and ". Please explain to me.

Thanks

Gianfranco

[phjvh 0]

Hi,

 

(A:sim on ground,bool) !
if{

(A:GPS WP ETE, minutes) 2 <
(A:GPS IS ACTIVE WAY POINT,bool)
(A:ELECTRICAL AVIONICS BUS VOLTAGE, volts) 10 >
and and

if{ 1 } els{ 0 }

 }
els{ 0 }

 

 

A translation:

If airborne (A:sim on ground,bool) !,

 

then the value is "1", when the 3 arguments,
(A:GPS WP ETE, minutes) 2 <
(A:GPS IS ACTIVE WAY POINT,bool)
(A:ELECTRICAL AVIONICS BUS VOLTAGE, volts) 10 >
and and,
are true.
if not, one of the arguments is false, the value is "0".

 

On the ground the value will be "0".

 

[mgh 89]

Simply out of interest, what value does (A:GPS WP ETE, minutes) return with the aircraft on ground?

[WarpD 824]

Simply out of interest, what value does (A:GPS WP ETE, minutes) return with the aircraft on ground?

Depends on if the aircraft is in motion or not.  If it's in motion, it will return a value... hence the need to test for being airborne.

[mgh 89]

Depends on if the aircraft is in motion or not.  If it's in motion, it will return a value... hence the need to test for being airborne.

 

What value does it return if the aircraft's in motion?

 

Also what value does it return if the aircraft's airborne but not moving towards the waypoint?

[phjvh 0]

My observations ETE minutes:

 

On the ground: "0" when parking brakes are on and "a whole lot" during taxiing.

 

In the air: the amount of minutes to the waypoint and when holding the number increases on the outbound leg and decreases, of course, on the inbound leg.

 

When moving in a circle around the wpt, so distance stays the same, the number of minutes remain even.

[mgh 89]

Could a "whole lot" be distance to way point divided by velocity component towards waypoint?

[phjvh 0]

Didn't calculate that, but probably "the whole lot" is the amount of minutes to get to the waypoint whatever direction one is moving, so i think you are right.

(Time = Distance / Velocity)

[spokes2112 179]

YUP,

 

 Just to add,

  <Value>
     (A:sim on ground,bool) !
     if{
       (A:GPS WP ETE, minutes) 2 <
      (A:GPS IS ACTIVE WAY POINT,bool)
       (A:ELECTRICAL AVIONICS BUS VOLTAGE, volts) 10 >
       and and
       if{ 1 }
       els{ 0 }
       }
     els{ 0 }
   </Value>

Is exactly as the same  as  - 

  <Value>
     (A:sim on ground,bool) !
     (A:GPS WP ETE, minutes) 2 <
     (A:GPS IS ACTIVE WAY POINT,bool)
     (A:ELECTRICAL AVIONICS BUS VOLTAGE, volts) 10 >
      and and and
  </Value>

Just an example, as a lesson perse' , alternate ways to do the same thing.

 

P.S. Anyone talk to Arne Bartels lately?   

[phjvh 0]

Right,

 

FTR, i use only:

<Value>(A:GPS DRIVES NAV1,bool) (A:GPS WP ETE,minutes) 2 < and</Value>

for obvious reasons.

 

[n4gix 4,947]

Arne has been conspicuous by his absence now for about three years. I've tried several times to re-establish contact with him via email, but never got a reply. :(

 

@Roman, you are quite correct. The only real "purpose" for using the { 1 } and { 0 } constructs is for ease of human understanding... :Nerd: