A2A C172 Transponder question

[kaha]

Hello, does any of you control the Transponder in the C172 by external buttons for entering the code? It doesn't work here. The L-Values

L:xpdr_0_button  up to   L:xpdr_7_button

move in, but nothing happens. Clicking them with the mouse works of course. Other equipment in the C172 like the KR87 ADF works when controlled externally.

Any ideas are appreciated greatly!

Thx,
Karl

[stiletto2]

Using MSFS, I control XPDR using GoFlight GF-46 which is programmed using the GoFlight Interface Tool (GIT) which requires FSUIPC7.   I suspect this may be a whole different external method of control than you are talking about.

Rod

[kaha]

Thank you Rod. I don't know how Goflight handles this.

Here's what I am doing: I use an Arduino (I use the Teensy 3.6, it can control a lot of rotary encoders and buttons simultaneously) to control some buttons and rotary encoders. This goes via serial communication to a lua script in FSUIPC 7. This also allows bidirectional communication in order to show frequencies on 7-segment displays externally (future project). My aim is to build some analog equipment like ADF, Transponder, Autopilot or radios. Everything is still in test, though.

Here is an example how I control the ADF by changing the standby frequency with external rotary encoders and controlling the frequency swap button:

https://vimeo.com/517452261

This is another example controlling the transponder solely by rotary encoders (on/off switch, change code):

https://vimeo.com/517452163

And here is a video of how the transponder buttons work in the sim and how they don't work externally controlled. The buttons move, but the code doesn't change.

https://vimeo.com/517452077

Karl

[kaha]

Using mouse macros is probably the only solution here.

Karl

[stiletto2]

Hi Karl,

After watching your videos, I realize that I should have told you that the only thing I control in the XPDR is the digits by rotary encoder as you did in one of your videos.  Sorry, I missed that your original post talked about programming the XPDR by pushing the 8 buttons.  I am not aware of how that would be done. 

Arduinos looks like a lot of fun to play with but that level of engineering is too heavy duty for me.

Have fun,

Rod