Interfacing real 727 eng gauges

[Melnato]

Great new Rob!

How do you get the gauges to work IF they dont have FSUIPC offsets?
Or have you been lucky enough to have offsets for your gauges?
Can you program functions in SIOC that normally dont exist???

Confused and envious...

Nat

[737NUT]

Great new Rob!

How do you get the gauges to work IF they dont have FSUIPC offsets?
Or have you been lucky enough to have offsets for your gauges?
Can you program functions in SIOC that normally dont exist???

Confused and envious...

Nat

Thanks! FSUIPC offset 0898 is Eng 1 N1 rpm. Nothing hidden or special. I used the calculations for my set-up and programmed sioc accordingly. See this site, http://www.baron58.com/Servo_Calc.htm

So with that info and Mike's PIC knowledge, this project was a sucess and very affordable considering the price of simkits.. I'll take real stuff anyday.

[Melnato]

OK so as long as there is an offset, you can pretty much control any real gauge...unreal

Nat

[LH784]

Unbelievably impressive, really "wow"

Nat: there are Offsets listed for most engine parameters, for 4 engines. You get no Offsets for the APU, but as far as you are looking for N1, N2, EGT etc they are there - see Pete's FSUIPC documentation. So principally it should indeed be possible to get the whole engine stack populated (anyone, please correct me if I'm wring, but after this thread I think almost everything is possible).

Rob: If you could post some pics, also about how you actually interface the gauge with the wires. And does it automatically convert the incoming signal into both the index and digital readouts ?

Once again: congratuilations to "the team",
Florian

[737NUT]

I'll pull apart one of the gauges this weekend and take pictures for everyone. The incoming signals are a TAch signal generated by the PIC and the gauge has it's own internal processors which drive the pointer and the digital display. What made this project MUCH easier and even possible at all was the fact i was able to secure the actual build and design specs from the company that made the gauge. The dial is actually driven by a stepper motor inside the gauge. Neat stuff! There was no need to reverse engineer this gauge do to having all the pertinent info.

[737NUT]

Have a video made of the gauge working but it is in Avi and i can't upload it. Can anyone host it? Thanks Rob


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Link to Video HERE
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[737NUT]

Here is a picture of the PCB i got today and all the components installed and working.

[Melnato]

OK making the needle move is impressive enough...
but the digital read out too!!!!!!!!!!!!???????????

Nat

[727-JCK]

Hi Rob,

I came accross this thread while looking for something completely different and, all out of a sudden, I realized that you guys just made my day!!! I'm awestruck. Congratulations to this great work!
A couple of month ago I still thought that I was pretty much alone to be crazy enough to try to interface real instruments. Today I see that you takkled the same probelm that I have since some weeks: I'm trying to put together and interface a 727 main instrument panel with original gauges and I was lucky enough to get the chance to buy a whole engine stack with these instruments you also have: 3xN1, 3xN2, 3xTGT and 3xPR. Since then I was looking for some documentation on these gauges. Since you were already so successful, I'd have two questions:
I saw that you posted already the documentation for the N1 gauge. Did the company send you also the docs for the other gauges? If yes, would you do me a great favour and share them? I'll happily share documentation fom my archive in case you need some...
Then, since more than a year passed since the last post: What are your experiences in the meantime? Did you stay with the setup as posted, or did you do some more fine tuning?

As a matter of fact, this is my first post in a forum what so ever. I hop this arrives where it should. In case I'm missing out on something, I'm always happy to learn...

By the way, will anyone of you be in Le Bourget for this small club meeting of aviation ethousiasts his WE? I will, so maybe see you there.

Congrats again to all of you and best regards,

Jens

[737NUT]

The N2 gauge is identical to the N1. I have the pin-out for the EGT gauge. Give me your email address and i will send it to you. Glad this has helped you out. Make sure your power supply ground is shared with the instrument ground. Other than that, it is trouble free.

Rob